ITkSiSpacePointsSeedMaker.cxx

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/*
    Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
  */

//   Implementation file for class ITk::SiSpacePointsSeedMaker
// (c) ATLAS Detector software
// AlgTool used for TRT_DriftCircleOnTrack object production
// Version 1.0 21/04/2004 I.Gavrilenko
 
#include "SiSpacePointsSeedTool_xk/ITkSiSpacePointsSeedMaker.h"
 
#include "InDetPrepRawData/SiCluster.h"
 
 
//for validation
#include "TrkTrack/Track.h"
#include "TrkParameters/TrackParameters.h"
#include "CxxUtils/checker_macros.h"
 
#include <cmath>
 
#include <iomanip>
#include <ostream>
 
namespace ITk
{

// Constructor
 
SiSpacePointsSeedMaker::SiSpacePointsSeedMaker(const std::string &t, const std::string &n, const IInterface *p)
    : base_class(t, n, p),
    m_thistSvc("THistSvc", n),
    m_outputTree(nullptr),
    m_treeName(""),
    m_treeFolder("/valNtuples/")
{
  if (m_maxOneSize > 0)
  {
    m_maxOneSizeSSS = m_maxOneSize;
    m_maxOneSizePPP = m_maxOneSize;
  }
}

// Initialisation
 
StatusCode SiSpacePointsSeedMaker::initialize()
{
  StatusCode sc = AlgTool::initialize();
 
  ATH_CHECK(m_spacepointsPixel.initialize(m_pixel));
  ATH_CHECK(m_spacepointsStrip.initialize(m_strip));
  ATH_CHECK(m_spacepointsOverlap.initialize(m_useOverlap));
 
  // Get beam geometry
  //
  ATH_CHECK(m_beamSpotKey.initialize());
 
  ATH_CHECK(m_fieldCondObjInputKey.initialize());
 
  // PRD-to-track association (optional)
  ATH_CHECK(m_prdToTrackMap.initialize(!m_prdToTrackMap.key().empty()));
 
  // Build framework
  //
  buildFrameWork();
 
  // Get output print level
  //
  m_outputlevel = msg().level() - MSG::DEBUG;
 
  m_umax = 100. - std::abs(m_umax) * 300.;
 
  if (m_writeNtuple) {
    //coverity[MISSING_LOCK]
    ATH_CHECK( m_thistSvc.retrieve() );
 
    m_treeName = (std::string("SeedTree_")+name());
    std::replace( m_treeName.begin(), m_treeName.end(), '.', '_' );
 
    m_outputTree = new TTree( m_treeName.c_str() , "SeedMakerValTool");
 
    m_outputTree->Branch("eventNumber",    &m_eventNumber,"eventNumber/L");
    m_outputTree->Branch("d0",             &m_d0);
    m_outputTree->Branch("z0",             &m_z0);
    m_outputTree->Branch("pt",             &m_pt);
    m_outputTree->Branch("eta",            &m_eta);
    m_outputTree->Branch("x1",             &m_x1);
    m_outputTree->Branch("x2",             &m_x2);
    m_outputTree->Branch("x3",             &m_x3);
    m_outputTree->Branch("y1",             &m_y1);
    m_outputTree->Branch("y2",             &m_y2);
    m_outputTree->Branch("y3",             &m_y3);
    m_outputTree->Branch("z1",             &m_z1);
    m_outputTree->Branch("z2",             &m_z2);
    m_outputTree->Branch("z3",             &m_z3);
    m_outputTree->Branch("r1",             &m_r1);
    m_outputTree->Branch("r2",             &m_r2);
    m_outputTree->Branch("r3",             &m_r3);
    m_outputTree->Branch("quality",        &m_quality);
    m_outputTree->Branch("seedType",       &m_type);
    m_outputTree->Branch("givesTrack",     &m_givesTrack);
    m_outputTree->Branch("dzdr_b",         &m_dzdr_b);
    m_outputTree->Branch("dzdr_t",         &m_dzdr_t);
    m_outputTree->Branch("track_pt",       &m_trackPt);
    m_outputTree->Branch("track_eta",      &m_trackEta);
 
    std::string fullTreeName = m_treeFolder + m_treeName;
 
    ATH_CHECK(  m_thistSvc->regTree( fullTreeName, m_outputTree )  );
 
  }
 
 
  return sc;
}

// Finalize
 
StatusCode SiSpacePointsSeedMaker::finalize()
{
  return AlgTool::finalize();
}

// Initialize tool for new event
 
void SiSpacePointsSeedMaker::newEvent(const EventContext &ctx, EventData &data, int iteration) const
{
  if (!m_pixel && !m_strip)
    return;

  if (not data.initialized)
    initializeEventData(data, ctx);

  erase(data);
  data.trigger = false;
  data.iteration = iteration;
  if (iteration <= 0)
    data.iteration = 0;
  data.dzdrmin = m_dzdrmin0;
  data.checketa = data.dzdrmin > 1.;
  data.dzdrmax = m_dzdrmax0;
  data.maxScore = m_maxScore; 
  data.r_first = 0;

  float oneOverBinSizeR = 1. / m_binSizeR;
  int maxBinR = m_nBinsR - 1;

  data.i_ITkSpacePointForSeed = data.l_ITkSpacePointForSeed.begin();
 
  bool isPixel = (m_fastTracking && m_pixel) || data.iteration == 1;
 
  if (not isPixel)
  {
    // Now, we will populate the space point list in the event data object.
 
    // Set the seed multiplicity strategy of the event data to the one configured
    // by the user for strip seeds
    data.maxSeedsPerSP = m_maxOneSizeSSS;
    data.keepAllConfirmedSeeds = m_alwaysKeepConfirmedStripSeeds;
 
    SG::ReadHandle<Trk::PRDtoTrackMap> prd_to_track_map;
    const Trk::PRDtoTrackMap *prd_to_track_map_cptr = nullptr;
    if (!m_prdToTrackMap.key().empty()) {
      prd_to_track_map = SG::ReadHandle<Trk::PRDtoTrackMap>(m_prdToTrackMap, ctx);
      if (!prd_to_track_map.isValid()) {
        ATH_MSG_ERROR("Failed to read PRD to track association map: " << m_prdToTrackMap.key());
      }
      prd_to_track_map_cptr = prd_to_track_map.cptr();
    }
 
    SG::ReadHandle<SpacePointContainer> spacepointsStrip{m_spacepointsStrip, ctx};
    if (spacepointsStrip.isValid()) {
      for (const SpacePointCollection *spc : *spacepointsStrip) {
        for (const Trk::SpacePoint *sp : *spc) {
          if ((prd_to_track_map_cptr && isUsed(sp, *prd_to_track_map_cptr)) || sp->r() > m_r_rmax || sp->r() < m_r_rmin)
            continue;
          SiSpacePointForSeed *sps = newSpacePoint(data, sp);
          if (!sps)
            continue;

          int radiusBin = static_cast<int>(sps->radius() * oneOverBinSizeR);
          if (radiusBin > maxBinR)
            radiusBin = maxBinR;
          data.r_ITkSorted[radiusBin].push_back(sps);
          ++data.r_map[radiusBin];
          if (data.r_map[radiusBin] == 1)
            data.r_index[data.nr++] = radiusBin;
          ++data.ns;
        }
      }
    }
    if (m_useOverlap && !data.checketa) {
      SG::ReadHandle<SpacePointOverlapCollection> spacepointsOverlap{m_spacepointsOverlap, ctx};
      if (spacepointsOverlap.isValid()) {
        for (const Trk::SpacePoint *sp : *spacepointsOverlap) {
          if ((prd_to_track_map_cptr && isUsed(sp, *prd_to_track_map_cptr)) || sp->r() > m_r_rmax || sp->r() < m_r_rmin)
            continue;

          SiSpacePointForSeed *sps = newSpacePoint(data, sp);
          if (!sps)
            continue;

          int radiusBin = static_cast<int>(sps->radius() * oneOverBinSizeR);
          if (radiusBin > maxBinR)
            radiusBin = maxBinR;
          data.r_ITkSorted[radiusBin].push_back(sps);
          ++data.r_map[radiusBin];
          if (data.r_map[radiusBin] == 1)
            data.r_index[data.nr++] = radiusBin;
          ++data.ns;
        }
      }
    }
  } else {
 
    // Now, we will populate the space point list in the event data object.
 
    // Set the seed multiplicity strategy of the event data to the one configured
    // by the user for pixel seeds
    data.maxSeedsPerSP = m_maxOneSizePPP;
    data.keepAllConfirmedSeeds = m_alwaysKeepConfirmedPixelSeeds;
 
    SG::ReadHandle<Trk::PRDtoTrackMap> prd_to_track_map;
    const Trk::PRDtoTrackMap *prd_to_track_map_cptr = nullptr;
    if (!m_prdToTrackMap.key().empty()) {
      prd_to_track_map = SG::ReadHandle<Trk::PRDtoTrackMap>(m_prdToTrackMap, ctx);
      if (!prd_to_track_map.isValid()) {
        ATH_MSG_ERROR("Failed to read PRD to track association map: " << m_prdToTrackMap.key());
      }
      prd_to_track_map_cptr = prd_to_track_map.cptr();
    }
 
    SG::ReadHandle<SpacePointContainer> spacepointsPixel{m_spacepointsPixel, ctx};
    if (spacepointsPixel.isValid()) {
      for (const SpacePointCollection *spc : *spacepointsPixel) {
        for (const Trk::SpacePoint *sp : *spc) {
          if ((prd_to_track_map_cptr && isUsed(sp, *prd_to_track_map_cptr)) || sp->r() > m_r_rmax || sp->r() < m_r_rmin)
            continue;

          SiSpacePointForSeed *sps = newSpacePoint(data, sp);
          if (!sps)
            continue;

          int radiusBin = static_cast<int>(sps->radius() * oneOverBinSizeR);
          if (radiusBin > maxBinR)
            radiusBin = maxBinR;

          data.r_ITkSorted[radiusBin].push_back(sps);
          ++data.r_map[radiusBin];
          if (data.r_map[radiusBin] == 1)
            data.r_index[data.nr++] = radiusBin;
          ++data.ns;
        }          
      }             
    }              
  }
}

// Initialize tool for new region
 
void SiSpacePointsSeedMaker::newRegion(const EventContext &ctx, EventData &data,
                                       const std::vector<IdentifierHash> &vPixel, const std::vector<IdentifierHash> &vStrip) const
{
  if (!m_pixel && !m_strip)
    return;
 
  if (not data.initialized)
    initializeEventData(data, ctx);
  erase(data);
  data.iteration = 0;
  data.trigger = false;
  data.dzdrmin = m_dzdrmin0;
  data.dzdrmax = m_dzdrmax0;
  data.maxScore = m_maxScore;
  data.r_first = 0;
  data.checketa = false;

  float oneOverBinSizeR = 1. / m_binSizeR; //was float irstep = 1.f/m_binSizeR;
  int maxBinR = m_nBinsR - 1;              //was int   irmax  = m_nBinsR-1;

  data.i_ITkSpacePointForSeed = data.l_ITkSpacePointForSeed.begin();
 
  SG::ReadHandle<Trk::PRDtoTrackMap> prd_to_track_map;
  const Trk::PRDtoTrackMap *prd_to_track_map_cptr = nullptr;
  if (!m_prdToTrackMap.key().empty())
  {
    prd_to_track_map = SG::ReadHandle<Trk::PRDtoTrackMap>(m_prdToTrackMap, ctx);
    if (!prd_to_track_map.isValid())
    {
      ATH_MSG_ERROR("Failed to read PRD to track association map: " << m_prdToTrackMap.key());
    }
    prd_to_track_map_cptr = prd_to_track_map.cptr();
  }
 
  // Get pixels space points containers from store gate
  //
  if (m_pixel && !vPixel.empty())
  {
 
    SG::ReadHandle<SpacePointContainer> spacepointsPixel{m_spacepointsPixel, ctx};
    if (spacepointsPixel.isValid())
    {
      data.maxSeedsPerSP = m_maxOneSizePPP;
 
      // Loop through all trigger collections
      //
      for (const IdentifierHash &l : vPixel)
      {
        const auto *w = spacepointsPixel->indexFindPtr(l);
        if (w == nullptr)
          continue;
        for (const Trk::SpacePoint *sp : *w)
        {
          float r = sp->r();
          if ((prd_to_track_map_cptr && isUsed(sp, *prd_to_track_map_cptr)) || r > m_r_rmax || r < m_r_rmin)
            continue;
          SiSpacePointForSeed *sps = newSpacePoint(data, sp);
          int ir = static_cast<int>(sps->radius() * oneOverBinSizeR);
          if (ir > maxBinR)
            ir = maxBinR;
          data.r_ITkSorted[ir].push_back(sps);
          ++data.r_map[ir];
          if (data.r_map[ir] == 1)
            data.r_index[data.nr++] = ir;
          ++data.ns;
        }
      }
    }
  }
 
  // Get strip space points containers from store gate
  //
  if (m_strip && !vStrip.empty())
  {
    data.maxSeedsPerSP = m_maxOneSizeSSS;
 
    SG::ReadHandle<SpacePointContainer> spacepointsStrip{m_spacepointsStrip, ctx};
    if (spacepointsStrip.isValid())
    {
 
      // Loop through all trigger collections
      //
      for (const IdentifierHash &l : vStrip)
      {
        const auto *w = spacepointsStrip->indexFindPtr(l);
        if (w == nullptr)
          continue;
        for (const Trk::SpacePoint *sp : *w)
        {
          float r = sp->r();
          if ((prd_to_track_map_cptr && isUsed(sp, *prd_to_track_map_cptr)) || r > m_r_rmax || r < m_r_rmin)
            continue;
          SiSpacePointForSeed *sps = newSpacePoint(data, sp);
          int ir = static_cast<int>(sps->radius() * oneOverBinSizeR);
          if (ir > maxBinR)
            ir = maxBinR;
          data.r_ITkSorted[ir].push_back(sps);
          ++data.r_map[ir];
          if (data.r_map[ir] == 1)
            data.r_index[data.nr++] = ir;
          ++data.ns;
        }
      }
    }
  }
}

// Initialize tool for new region
 
void SiSpacePointsSeedMaker::newRegion(const EventContext &ctx, EventData &data,
                                       const std::vector<IdentifierHash> &vPixel, const std::vector<IdentifierHash> &vStrip, const IRoiDescriptor &IRD) const
{
  constexpr float twoPi = 2. * M_PI;
 
   newRegion(ctx, data, vPixel, vStrip);
   data.trigger = true;
 
   double dzdrmin = 1. / std::tan(2. * std::atan(std::exp(-IRD.etaMinus())));
   double dzdrmax = 1. / std::tan(2. * std::atan(std::exp(-IRD.etaPlus())));
 
   data.zminB = IRD.zedMinus() - data.zbeam[0]; // min bottom Z
   data.zmaxB = IRD.zedPlus() - data.zbeam[0];  // max bottom Z
   data.zminU = data.zminB + 550. * dzdrmin;
   data.zmaxU = data.zmaxB + 550. * dzdrmax;
   double fmax = IRD.phiPlus();
   double fmin = IRD.phiMinus();
   if (fmin > fmax)
     fmin -= twoPi;
   data.ftrig = (fmin + fmax) * .5;
   data.ftrigW = (fmax - fmin) * .5;
}
 

// Methods to initilize different strategies of seeds production
// with two space points with or without vertex constraint
 
void SiSpacePointsSeedMaker::find2Sp(EventData &/*data*/, const std::list<Trk::Vertex> &/*lv*/) const
{
  ATH_MSG_WARNING("ITk::SiSpacePointsSeedMaker::find2Sp not implemented!");
}

// Methods to initilize different strategies of seeds production
// with three space points with or without vertex constraint
 
void SiSpacePointsSeedMaker::find3Sp(const EventContext & ctx, EventData &data, const std::list<Trk::Vertex> &lv) const
{
  if (not data.initialized)
    initializeEventData(data, ctx);

  fillLists(data);

  data.zminU = m_zmin;
  data.zmaxU = m_zmax;
  int mode = 2;
  if (lv.begin() != lv.end())
    mode = 3;
  bool newv = newVertices(data, lv);
  if (newv || !data.state || data.nspoint != 3 || data.mode != mode || data.nlist)
  {
    data.i_ITkSeedEnd = data.i_ITkSeeds.begin();
    data.state = 1;
    data.nspoint = 3;
    data.nlist = 0;
    data.mode = mode;
    data.endlist = true;
    data.fvNmin = 0;
    data.fNmin = 0;
    data.zMin = 0;
    production3Sp(data); 
  }

  data.i_ITkSeed = data.i_ITkSeeds.begin();
 
  if (msgLvl(MSG::DEBUG))
  {
    data.nprint = 1;
    dump(data, msg(MSG::DEBUG));
  }
}

// Methods to initilize different strategies of seeds production
// with three space points with or without vertex constraint
 
void SiSpacePointsSeedMaker::find3Sp(const EventContext &ctx, EventData &data, const std::list<Trk::Vertex> &lv, const double *ZVertex) const
{
  if (not data.initialized)
    initializeEventData(data, ctx);

  fillLists(data);

  data.zminU = ZVertex[0];
  if (data.zminU < m_zmin)
    data.zminU = m_zmin; 
  data.zmaxU = ZVertex[1];
  if (data.zmaxU > m_zmax)
    data.zmaxU = m_zmax; 

  int mode = 2;
  if (lv.begin() != lv.end())
    mode = 3;
  bool newv = newVertices(data, lv);
  if (newv || !data.state || data.nspoint != 3 || data.mode != mode || data.nlist)
  {
    data.i_ITkSeedEnd = data.i_ITkSeeds.begin();
    data.state = 1;
    data.nspoint = 3;
    data.nlist = 0;
    data.mode = mode;
    data.endlist = true;
    data.fvNmin = 0;
    data.fNmin = 0;
    data.zMin = 0;
    production3Sp(data); 
  }
  data.i_ITkSeed = data.i_ITkSeeds.begin();
 
  if (msgLvl(MSG::DEBUG))
  {
    data.nprint = 1;
    dump(data, msg(MSG::DEBUG));
  }
}

// Methods to initilize different strategies of seeds production
// with variable number space points with or without vertex constraint
// Variable means (2,3,4,....) any number space points
 
void SiSpacePointsSeedMaker::findVSp(const EventContext &ctx, EventData &data, const std::list<Trk::Vertex> &lv) const
{
 
  if (not data.initialized)
    initializeEventData(data, ctx);

  fillLists(data);
 
  data.zminU = m_zmin;
  data.zmaxU = m_zmax;
 
  int mode = 5;
  if (lv.begin() != lv.end())
    mode = 6;
  bool newv = newVertices(data, lv);
 
  if (newv || !data.state || data.nspoint != 4 || data.mode != mode || data.nlist)
  {
    data.i_ITkSeedEnd = data.i_ITkSeeds.begin();
    data.state = 1;
    data.nspoint = 4;
    data.nlist = 0;
    data.mode = mode;
    data.endlist = true;
    data.fvNmin = 0;
    data.fNmin = 0;
    data.zMin = 0;
    production3Sp(data);
  }
  data.i_ITkSeed = data.i_ITkSeeds.begin();
 
  if (msgLvl(MSG::DEBUG))
  {
    data.nprint = 1;
    dump(data, msg(MSG::DEBUG));
  }
}

// Dumps relevant information into the MsgStream
 
MsgStream &SiSpacePointsSeedMaker::dump(EventData &data, MsgStream &out) const
{
  if (data.nprint)
    return dumpEvent(data, out);
  return dumpConditions(data, out);
}

// Dumps conditions information into the MsgStream
 
MsgStream &SiSpacePointsSeedMaker::dumpConditions(EventData &data, MsgStream &out) const
{
  int n = 42-m_spacepointsPixel.key().size();
  std::string s2;
  for (int i=0; i<n; ++i) s2.append(" ");
  s2.append("|");
  n     = 42-m_spacepointsStrip.key().size();
  std::string s3;
  for (int i=0; i<n; ++i) s3.append(" ");
  s3.append("|");
  n     = 42-m_spacepointsOverlap.key().size();
  std::string s4;
  for (int i=0; i<n; ++i) s4.append(" ");
  s4.append("|");
  n     = 42-m_beamSpotKey.key().size();
  std::string s5;
  for (int i=0; i<n; ++i) s5.append(" ");
  s5.append("|");
 
  out<<"|---------------------------------------------------------------------|"
     <<endmsg;
  out<<"| Pixel    space points   | "<<m_spacepointsPixel.key() <<s2
     <<endmsg;
  out<<"| Strip    space points   | "<<m_spacepointsStrip.key()<<s3
     <<endmsg;
  out<<"| Overlap  space points   | "<<m_spacepointsOverlap.key()<<s4
     <<endmsg;
  out<<"| BeamConditionsService   | "<<m_beamSpotKey.key()<<s5
     <<endmsg;
  out<<"| usePixel                | "
     <<std::setw(12)<<m_pixel 
     <<"                              |"<<endmsg;
  out<<"| useStrip                  | "
     <<std::setw(12)<<m_strip
     <<"                              |"<<endmsg;
  out<<"| maxSize                 | "
     <<std::setw(12)<<m_maxsize 
     <<"                              |"<<endmsg;
  out<<"| maxSizeSP               | "
     <<std::setw(12)<<m_maxsizeSP
     <<"                              |"<<endmsg;
  out<<"| pTmin  (mev)            | "
     <<std::setw(12)<<std::setprecision(5)<<m_ptmin
     <<"                              |"<<endmsg;
  out<<"| max radius SP           | "
     <<std::setw(12)<<std::setprecision(5)<<m_r_rmax 
     <<"                              |"<<endmsg;
  out<<"| radius step             | "
     <<std::setw(12)<<std::setprecision(5)<<m_binSizeR
     <<"                              |"<<endmsg;
  out<<"| min Z-vertex position   | "
     <<std::setw(12)<<std::setprecision(5)<<m_zmin
     <<"                              |"<<endmsg;
  out<<"| max Z-vertex position   | "
     <<std::setw(12)<<std::setprecision(5)<<m_zmax
     <<"                              |"<<endmsg;
  out<<"| min space points dR SSS | "
     <<std::setw(12)<<std::setprecision(5)<<m_drminSSS
     <<"                              |"<<std::endl;
  out<<"| max space points dR SSS | "
     <<std::setw(12)<<std::setprecision(5)<<m_drmaxSSS
     <<"                              |"<<std::endl;
  out<<"| min space points dR PPP | "
     <<std::setw(12)<<std::setprecision(5)<<m_drminPPP
     <<"                              |"<<std::endl;
  out<<"| max space points dR PPP | "
     <<std::setw(12)<<std::setprecision(5)<<m_drmaxPPP
     <<"                              |"<<std::endl;
  out<<"| max dZ    impact        | "
     <<std::setw(12)<<std::setprecision(5)<<m_dzver 
     <<"                              |"<<endmsg;
  out<<"| max dZ/dR impact        | "
     <<std::setw(12)<<std::setprecision(5)<<m_dzdrver 
     <<"                              |"<<endmsg;
  out<<"| max       impact        | "
     <<std::setw(12)<<std::setprecision(5)<<m_maxdImpact
     <<"                              |"<<endmsg;
  out<<"| max       impact sss    | "
     <<std::setw(12)<<std::setprecision(5)<<m_maxdImpactSSS
     <<"                              |"<<endmsg;
  out<<"|---------------------------------------------------------------------|"
     <<endmsg;
  out<<"| Beam X center           | "
     <<std::setw(12)<<std::setprecision(5)<<data.xbeam[0]
     <<"                              |"<<endmsg;
  out<<"| Beam Y center           | "
     <<std::setw(12)<<std::setprecision(5)<<data.ybeam[0]
     <<"                              |"<<endmsg;
  out<<"| Beam Z center           | "
     <<std::setw(12)<<std::setprecision(5)<<data.zbeam[0]
     <<"                              |"<<endmsg;
  out<<"| Beam X-axis direction   | "
     <<std::setw(12)<<std::setprecision(5)<<data.xbeam[1]
     <<std::setw(12)<<std::setprecision(5)<<data.xbeam[2]
     <<std::setw(12)<<std::setprecision(5)<<data.xbeam[3]
     <<"      |"<<endmsg;
  out<<"| Beam Y-axis direction   | "
     <<std::setw(12)<<std::setprecision(5)<<data.ybeam[1]
     <<std::setw(12)<<std::setprecision(5)<<data.ybeam[2]
     <<std::setw(12)<<std::setprecision(5)<<data.ybeam[3]
     <<"      |"<<endmsg;
  out<<"| Beam Z-axis direction   | "
     <<std::setw(12)<<std::setprecision(5)<<data.zbeam[1]
     <<std::setw(12)<<std::setprecision(5)<<data.zbeam[2]
     <<std::setw(12)<<std::setprecision(5)<<data.zbeam[3]
     <<"      |"<<endmsg;
  out<<"|---------------------------------------------------------------------|"
     <<endmsg;
  return out;
 
 
}

// Dumps event information into the MsgStream
 
MsgStream &SiSpacePointsSeedMaker::dumpEvent(EventData &data, MsgStream &out) 
{
  out<<"|---------------------------------------------------------------------|"
     <<endmsg;
  out<<"| ns                    | "
     <<std::setw(12)<<data.ns
     <<"                              |"<<endmsg;
  out<<"| nsaz                  | "
     <<std::setw(12)<<data.nsaz
     <<"                              |"<<endmsg;
  out<<"| nsazv                 | "
     <<std::setw(12)<<data.nsazv
     <<"                              |"<<endmsg;
  out<<"| seeds                   | "
     <<std::setw(12)<<data.i_ITkSeeds.size()
     <<"                              |"<<endmsg;
  out<<"|---------------------------------------------------------------------|"
     <<endmsg;
  return out;
 
}

// Find next set space points
 
void SiSpacePointsSeedMaker::findNext(EventData &data) const
{
  if (data.endlist)
    return;
 
  data.i_ITkSeedEnd = data.i_ITkSeeds.begin();
 
  if (data.mode == 2 || data.mode == 3 || data.mode == 5 || data.mode == 6)
    production3Sp(data);
 
  data.i_ITkSeed = data.i_ITkSeeds.begin();
  ++data.nlist;
}

// New and old list vertices comparison
 
bool SiSpacePointsSeedMaker::newVertices(EventData &data, const std::list<Trk::Vertex> &lV) const
{
 
  unsigned int s1 = data.l_vertex.size();
  unsigned int s2 = lV.size();

  data.isvertex = false;
  if (s1 == 0 && s2 == 0)
    return false;

  data.l_vertex.clear();
  if (s2 == 0)
    return false;

  data.isvertex = true;
  for (const Trk::Vertex &v : lV)
  {
    data.l_vertex.insert(static_cast<float>(v.position().z()));
  }

  data.zminU = (*data.l_vertex.begin()) - 20.;
  if (data.zminU < m_zmin)
    data.zminU = m_zmin;
  data.zmaxU = (*data.l_vertex.rbegin()) + 20.;
  if (data.zmaxU > m_zmax)
    data.zmaxU = m_zmax;
 
  return false;
}

// Initiate frame work for seed generator
 
void SiSpacePointsSeedMaker::buildFrameWork()
{
  m_ptmin = std::abs(m_ptmin);
 
  if (m_ptmin < 100.)
    m_ptmin = 100.;

  if (m_maxdImpactSSS < m_maxdImpact)
    m_maxdImpactSSS = m_maxdImpact;

  if (std::abs(m_etamin) < .1)
    m_etamin = -m_etamax;
  m_dzdrmax0 = 1. / std::tan(2. * std::atan(std::exp(-m_etamax)));
  m_dzdrmin0 = 1. / std::tan(2. * std::atan(std::exp(-m_etamin)));

  m_ipt = 1. / std::abs(m_ptmin);
  m_ipt2 = m_ipt * m_ipt;

  m_seedScoreThresholdPPPConfirmationSeed = m_seedScoreBonusPPP - 1.;
  m_seedScoreThresholdSSSConfirmationSeed = m_seedScoreBonusSSS - 1.;

  m_nBinsR = static_cast<int>((m_r_rmax + .1) / m_binSizeR);


  constexpr float twoPi = 2. * M_PI;

  const int nPhiBinsMax = arraySizePhi;
  const float inverseSizePhiMax = static_cast<float>(nPhiBinsMax) / twoPi; 
  constexpr float inverseSizePhiMin = 10. / twoPi;

 
  if (m_optimisePhiBinning)
  {
    const float radiusPixelStart = m_fastTracking ? 50. : 40.; 
    const float radiusPixelEnd = m_fastTracking ? 250. : 320.; 
    const float binSizePhi_PPP = m_pixel ? azimuthalStep(m_ptmin, m_maxdImpact, radiusPixelStart, radiusPixelEnd) / 3.f : 1.f;
    const float binSizePhi_SSS = m_strip ? azimuthalStep(m_ptmin, m_maxdImpactSSS, m_rminSSS, m_rmaxSSS) / 3.f : 1.f;
    m_inverseBinSizePhiPPP = 1. / binSizePhi_PPP;
    m_inverseBinSizePhiSSS = 1. / binSizePhi_SSS;
  }
  else
  {
    float ptm = 400.;
    if (m_ptmin < ptm)
      ptm = m_ptmin;
    m_inverseBinSizePhiPPP = m_inverseBinSizePhiSSS = ptm / 60.;
  }

  if (m_inverseBinSizePhiPPP > inverseSizePhiMax)
    m_inverseBinSizePhiPPP = inverseSizePhiMax;
  else if (m_inverseBinSizePhiPPP < inverseSizePhiMin)
    m_inverseBinSizePhiPPP = inverseSizePhiMin;
  if (m_inverseBinSizePhiSSS > inverseSizePhiMax)
    m_inverseBinSizePhiSSS = inverseSizePhiMax;
  else if (m_inverseBinSizePhiSSS < inverseSizePhiMin)
    m_inverseBinSizePhiSSS = inverseSizePhiMin;

  m_maxPhiBinPPP = static_cast<int>(twoPi * m_inverseBinSizePhiPPP);
  if (m_maxPhiBinPPP >= nPhiBinsMax) m_maxPhiBinPPP = nPhiBinsMax - 1;
  m_maxPhiBinSSS = static_cast<int>(twoPi * m_inverseBinSizePhiSSS);
  if (m_maxPhiBinSSS >= nPhiBinsMax) m_maxPhiBinSSS = nPhiBinsMax - 1;
  m_inverseBinSizePhiPPP = ( m_maxPhiBinPPP + 1 ) / twoPi;
  m_inverseBinSizePhiSSS = ( m_maxPhiBinSSS + 1 ) / twoPi;
 
  // Build radius-azimuthal-Z sorted containers for Z-vertices
  const int   nPhiBinsVertexMax  = arraySizePhiV;
  const float inverseBinSizePhiVertexMax = static_cast<float>(nPhiBinsVertexMax)/twoPi;
  m_inverseBinSizePhiVertex = m_ptmin/120.f;
  if (m_inverseBinSizePhiVertex > inverseBinSizePhiVertexMax) m_inverseBinSizePhiVertex = inverseBinSizePhiVertexMax;
  m_maxBinPhiVertex = static_cast<int>(twoPi*m_inverseBinSizePhiVertex);
  if (m_maxBinPhiVertex>=nPhiBinsVertexMax) m_maxBinPhiVertex = nPhiBinsVertexMax-1;
 
  buildConnectionMaps(m_nNeighbourCellsBottomPPP, m_nNeighbourCellsTopPPP,
                      m_neighbourCellsBottomPPP, m_neighbourCellsTopPPP,
                      m_maxPhiBinPPP, false);
 
  buildConnectionMaps(m_nNeighbourCellsBottomSSS, m_nNeighbourCellsTopSSS,
                      m_neighbourCellsBottomSSS, m_neighbourCellsTopSSS,
                      m_maxPhiBinSSS, true);
 
  buildConnectionMapsVertex(m_nNeighboursVertexPhiZ,
                m_neighboursVertexPhiZ,
                m_maxBinPhiVertex);
 
}
 
void SiSpacePointsSeedMaker::buildConnectionMaps(std::array<int, arraySizePhiZ> &nNeighbourCellsBottom,
                                                 std::array<int, arraySizePhiZ> &nNeighbourCellsTop,
                                                 std::array<std::array<int, arraySizeNeighbourBins>, arraySizePhiZ> &neighbourCellsBottom,
                                                 std::array<std::array<int, arraySizeNeighbourBins>, arraySizePhiZ> &neighbourCellsTop,
                                                 int maxPhiBin, bool isSSS)
{

 
  for (int phiBin = 0; phiBin <= maxPhiBin; ++phiBin)
  {
 
    int phiBelow = phiBin - 1;
    if (phiBelow < 0) phiBelow = maxPhiBin; 
 
    int phiAbove = phiBin + 1;
    if (phiAbove > maxPhiBin) phiAbove = 0; 

    for (int z = 0; z < arraySizeZ; ++z) {

 
      int twoDbinSamePhi = phiBin * arraySizeZ + z;
      int twoDbinLowerPhi = phiBelow * arraySizeZ + z;
      int twoDbinHigherPhi = phiAbove * arraySizeZ + z;
 
      nNeighbourCellsBottom[twoDbinSamePhi] = 3;
      nNeighbourCellsTop[twoDbinSamePhi] = 3;
 
      neighbourCellsBottom[twoDbinSamePhi][0] = twoDbinSamePhi;
      neighbourCellsTop[twoDbinSamePhi][0] = twoDbinSamePhi;
 
      neighbourCellsBottom[twoDbinSamePhi][1] = twoDbinLowerPhi;
      neighbourCellsTop[twoDbinSamePhi][1] = twoDbinLowerPhi;
 
      neighbourCellsBottom[twoDbinSamePhi][2] = twoDbinHigherPhi;
      neighbourCellsTop[twoDbinSamePhi][2] = twoDbinHigherPhi;

      if (z == 5)
      {
        nNeighbourCellsTop[twoDbinSamePhi] = 9;
        // in the central z region, we include the two neighbouring
        // z slices for the top neighbour search
 
        neighbourCellsTop[twoDbinSamePhi][3] = twoDbinSamePhi + 1;
        neighbourCellsTop[twoDbinSamePhi][4] = twoDbinLowerPhi + 1;
        neighbourCellsTop[twoDbinSamePhi][5] = twoDbinHigherPhi + 1;
        neighbourCellsTop[twoDbinSamePhi][6] = twoDbinSamePhi - 1;
        neighbourCellsTop[twoDbinSamePhi][7] = twoDbinLowerPhi - 1;
        neighbourCellsTop[twoDbinSamePhi][8] = twoDbinHigherPhi - 1;
      }
      // z > 5: positive z values, |z| > 250mm
      else if (z > 5)
      {
        // for the bottom SP search in positive non-central z, we include the
        // neighbouring Z region on the left (towards the IP) in the bottom
        // neighbour search
        nNeighbourCellsBottom[twoDbinSamePhi] = 6;
        neighbourCellsBottom[twoDbinSamePhi][3] = twoDbinSamePhi - 1;
        neighbourCellsBottom[twoDbinSamePhi][4] = twoDbinLowerPhi - 1;
        neighbourCellsBottom[twoDbinSamePhi][5] = twoDbinHigherPhi - 1;
 
        if (z < 10)
        {
          nNeighbourCellsTop[twoDbinSamePhi] = 6;
          neighbourCellsTop[twoDbinSamePhi][3] = twoDbinSamePhi + 1;
          neighbourCellsTop[twoDbinSamePhi][4] = twoDbinLowerPhi + 1;
          neighbourCellsTop[twoDbinSamePhi][5] = twoDbinHigherPhi + 1;
        }
      }
      // z < 5: negative z values, |z| > 250mm
      else
      {
        nNeighbourCellsBottom[twoDbinSamePhi] = 6;
        neighbourCellsBottom[twoDbinSamePhi][3] = twoDbinSamePhi + 1;
        neighbourCellsBottom[twoDbinSamePhi][4] = twoDbinLowerPhi + 1;
        neighbourCellsBottom[twoDbinSamePhi][5] = twoDbinHigherPhi + 1;
 
        if (z > 0)
        {
          // if there is a z region on the left (away from the IP), we include it in the top
          // neighbour search
          nNeighbourCellsTop[twoDbinSamePhi] = 6;
          neighbourCellsTop[twoDbinSamePhi][3] = twoDbinSamePhi - 1;
          neighbourCellsTop[twoDbinSamePhi][4] = twoDbinLowerPhi - 1;
          neighbourCellsTop[twoDbinSamePhi][5] = twoDbinHigherPhi - 1;
        }
      }

      if (isSSS)
      {
        if (z == 3)
        {
          nNeighbourCellsBottom[twoDbinSamePhi] = 9;
          neighbourCellsBottom[twoDbinSamePhi][6] = twoDbinSamePhi + 2;
          neighbourCellsBottom[twoDbinSamePhi][7] = twoDbinLowerPhi + 2;
          neighbourCellsBottom[twoDbinSamePhi][8] = twoDbinHigherPhi + 2;
        }
        else if (z == 7)
        {
          nNeighbourCellsBottom[twoDbinSamePhi] = 9;
          neighbourCellsBottom[twoDbinSamePhi][6] = twoDbinSamePhi - 2;
          neighbourCellsBottom[twoDbinSamePhi][7] = twoDbinLowerPhi - 2;
          neighbourCellsBottom[twoDbinSamePhi][8] = twoDbinHigherPhi - 2;
        }
      }
    }
  }
}

 
void SiSpacePointsSeedMaker::buildConnectionMapsVertex(std::array<int, arraySizePhiZV> &nNeighbourCells,
                               std::array<std::array<int, arraySizeNeighbourBinsVertex>, arraySizePhiZV> &neighbourCells,
                               int maxPhiBin)
{
  for (int phiBin=0; phiBin<=maxPhiBin; ++phiBin) {
 
    int phiBinBelow = phiBin-1;
    if (phiBinBelow<0) phiBinBelow=maxPhiBin;
 
    int phiBinTop = phiBin+1;
    if (phiBinTop>maxPhiBin) phiBinTop=0;

    for (int zbin=0; zbin<arraySizeZV; ++zbin) {
 
      int twoDbinSamePhi  = phiBin*arraySizeZV+zbin;
      int twoDbinLowerPhi  = phiBinBelow*arraySizeZV+zbin;
      int twoDbinHigherPhi  = phiBinTop*arraySizeZV+zbin;

      nNeighbourCells[twoDbinSamePhi]   = 3;
      neighbourCells[twoDbinSamePhi][0] = twoDbinSamePhi;
      neighbourCells[twoDbinSamePhi][1] = twoDbinLowerPhi;
      neighbourCells[twoDbinSamePhi][2] = twoDbinHigherPhi;

      if (zbin>1) {
        nNeighbourCells[twoDbinSamePhi]   = 6;
        neighbourCells[twoDbinSamePhi][3] = twoDbinSamePhi-1;
        neighbourCells[twoDbinSamePhi][4] = twoDbinLowerPhi-1;
        neighbourCells[twoDbinSamePhi][5] = twoDbinHigherPhi-1;
      }
      else if (zbin<1) {
        nNeighbourCells[twoDbinSamePhi]   = 6;
        neighbourCells[twoDbinSamePhi][3] = twoDbinSamePhi+1;
        neighbourCells[twoDbinSamePhi][4] = twoDbinLowerPhi+1;
        neighbourCells[twoDbinSamePhi][5] = twoDbinHigherPhi+1;
      }
    }
  }
}
 
float SiSpacePointsSeedMaker::azimuthalStep(const float pTmin, const float maxd0, const float Rmin, const float Rmax) 
{
  float Rm = pTmin / .6;

  float worstCaseD0 = maxd0;
  if (maxd0 > Rmin)
    worstCaseD0 = Rmin;
 
  float sI = std::abs(std::asin(worstCaseD0 / Rmin) - std::asin(worstCaseD0 / Rmax));
  float sF = std::abs(std::asin(std::min(1., Rmax / (2. * Rm))) -
                      std::asin(std::min(1., Rmin / (2. * Rm))));
  return sI + sF;
}

// Initiate beam frame work for seed generator
 
void SiSpacePointsSeedMaker::buildBeamFrameWork(EventData &data) const
{
  SG::ReadCondHandle<InDet::BeamSpotData> beamSpotHandle{m_beamSpotKey};
 
  const Amg::Vector3D &cb = beamSpotHandle->beamPos();
  double tx = std::tan(beamSpotHandle->beamTilt(0));
  double ty = std::tan(beamSpotHandle->beamTilt(1));
 
  double phi = std::atan2(ty, tx);
  double theta = std::acos(1. / std::sqrt(1. + tx * tx + ty * ty));
  double sinTheta = std::sin(theta);
  double cosTheta = std::cos(theta);
  double sinPhi = std::sin(phi);
  double cosPhi = std::cos(phi);
 
  data.xbeam[0] = static_cast<float>(cb.x());
  data.xbeam[1] = static_cast<float>(cosTheta * cosPhi * cosPhi + sinPhi * sinPhi);
  data.xbeam[2] = static_cast<float>(cosTheta * sinPhi * cosPhi - sinPhi * cosPhi);
  data.xbeam[3] = -static_cast<float>(sinTheta * cosPhi);
 
  data.ybeam[0] = static_cast<float>(cb.y());
  data.ybeam[1] = static_cast<float>(cosTheta * cosPhi * sinPhi - sinPhi * cosPhi);
  data.ybeam[2] = static_cast<float>(cosTheta * sinPhi * sinPhi + cosPhi * cosPhi);
  data.ybeam[3] = -static_cast<float>(sinTheta * sinPhi);
 
  data.zbeam[0] = static_cast<float>(cb.z());
  data.zbeam[1] = static_cast<float>(sinTheta * cosPhi);
  data.zbeam[2] = static_cast<float>(sinTheta * sinPhi);
  data.zbeam[3] = static_cast<float>(cosTheta);
}

// Initiate beam frame work for seed generator
void SiSpacePointsSeedMaker::convertToBeamFrameWork(EventData &data, const Trk::SpacePoint * sp, float * ATH_RESTRICT r) 
{
  r[0] = static_cast<float>(sp->globalPosition().x()) - data.xbeam[0];
  r[1] = static_cast<float>(sp->globalPosition().y()) - data.ybeam[0];
  r[2] = static_cast<float>(sp->globalPosition().z()) - data.zbeam[0];
}

// Initiate space points seed maker
 
void SiSpacePointsSeedMaker::fillLists(EventData &data) const
{
  constexpr float twoPi = 2. * M_PI;
 
  int firstRadialBin = 0;
  int lastRadialBin = 0;
  bool endcap = false;

 
  const std::map<float, int> ztoBin{
      {-2500., 0},
      {-1400., 1},
      {-925., 2},
      {-500., 3},
      {-250., 4},
      {250., 5},
      {500., 6},
      {925., 7},
      {1400, 8},
      {2500, 9},
      {100000, 10}, 
  };
 
  bool isPixel = (m_fastTracking && m_pixel) || data.iteration == 1;
 
  int nPhiBins = isPixel ? m_maxPhiBinPPP : m_maxPhiBinSSS;
  float inverseBinSizePhi = isPixel ? m_inverseBinSizePhiPPP : m_inverseBinSizePhiSSS;
 
  for (int radialBin = data.r_first; radialBin < m_nBinsR; ++radialBin)
  {
    if (!data.r_map[radialBin])
      continue;
 
    // Stop when we reach strip SP in PPP iteration #1
    std::vector<SiSpacePointForSeed *>::iterator SP_first = data.r_ITkSorted[radialBin].begin();
    if (isPixel && (*SP_first)->spacepoint->clusterList().second)
      break;

    if (firstRadialBin == 0)
      firstRadialBin = radialBin;
    lastRadialBin = radialBin;
 
    // loop over the space points in the r-bin and sort them into the 2d phi-z binning
    for (SiSpacePointForSeed *SP : data.r_ITkSorted[radialBin])
    {

      float Phi = SP->phi();
      if (Phi < 0.)
        Phi += twoPi; // phi is defined in [0..2pi] for the binning
      int phiBin = static_cast<int>(Phi * inverseBinSizePhi);
      if (phiBin < 0)
      {
        phiBin = nPhiBins;
      }
      else if (phiBin > nPhiBins)
      {
        phiBin = 0;
      }
 
      float Z = SP->z();
      endcap = (std::abs(Z) > 1490);
      int zBin{0};
      auto bound = ztoBin.lower_bound(Z);
      if (bound == ztoBin.end())
      {
        --bound; 
      }
      zBin = bound->second;

      int twoDbin = phiBin * arraySizeZ + zBin;
      ++data.nsaz;
      // push our space point into the 2D binned array
      data.rfz_ITkSorted[twoDbin].push_back(SP);

      if (!data.rfz_map[twoDbin]++)
        data.rfz_index[data.nrfz++] = twoDbin;
    }
  }
 
  data.state = 0;
 
  if (m_fastTracking) {
    // Loop through all RZ collections and sort them in radius order
    //
    for (int twoDbin(0); twoDbin != arraySizePhiZ; ++twoDbin) {
      if (data.rfz_ITkSorted[twoDbin].size() > 1) {
        std::sort(data.rfz_ITkSorted[twoDbin].begin(), data.rfz_ITkSorted[twoDbin].end(), SiSpacePointsComparison_R());
      }
    }
 
    if (m_strip) {
      data.RTmin = m_rminSSS ;
      data.RTmax = m_rmaxSSS ;
    }
 
  } else {
    if (isPixel) { // PPP
      data.RTmin = m_binSizeR*firstRadialBin+10. ;
      data.RTmax = m_binSizeR*lastRadialBin-10.;
    } else { //SSS
      if (endcap and m_isLRT) {
        data.RTmin = m_binSizeR*firstRadialBin+10. ;
        data.RTmax = m_binSizeR*lastRadialBin-10.;
      } else {
        data.RTmin = m_binSizeR*firstRadialBin+30. ;
        data.RTmax = m_binSizeR*lastRadialBin-150.;
      }
    }
  }
 
}

// Pixels information
 
void SiSpacePointsSeedMaker::pixInform(const Trk::SpacePoint *sp, float *r) 
{
  const InDet::SiCluster *cl = static_cast<const InDet::SiCluster *>(sp->clusterList().first);
  const InDetDD::SiDetectorElement *de = cl->detectorElement();
  const Amg::Transform3D &Tp = de->surface().transform();
  r[3] = float(Tp(0, 2));
  r[4] = float(Tp(1, 2));
  r[5] = float(Tp(2, 2));
}

// Strip information
 
void SiSpacePointsSeedMaker::stripInform(EventData &data, const Trk::SpacePoint *sp, float * ATH_RESTRICT r)
{
  const InDet::SiCluster *c0 = static_cast<const InDet::SiCluster *>(sp->clusterList().first);
  const InDet::SiCluster *c1 = static_cast<const InDet::SiCluster *>(sp->clusterList().second);
  const InDetDD::SiDetectorElement *d0 = c0->detectorElement();
  const InDetDD::SiDetectorElement *d1 = c1->detectorElement();
 
  Amg::Vector2D lc0 = c0->localPosition();
  Amg::Vector2D lc1 = c1->localPosition();
 
  std::pair<Amg::Vector3D, Amg::Vector3D> e0 =
      (d0->endsOfStrip(InDetDD::SiLocalPosition(lc0.y(), lc0.x(), 0.)));
  std::pair<Amg::Vector3D, Amg::Vector3D> e1 =
      (d1->endsOfStrip(InDetDD::SiLocalPosition(lc1.y(), lc1.x(), 0.)));
 
  Amg::Vector3D s0(.5 * (e0.first + e0.second));
  Amg::Vector3D s1(.5 * (e1.first + e1.second));
 
  Amg::Vector3D b0(.5 * (e0.second - e0.first));
  Amg::Vector3D b1(.5 * (e1.second - e1.first));
  Amg::Vector3D d02(s0 - s1);
 
  // b0
  r[3] = float(b0[0]);
  r[4] = float(b0[1]);
  r[5] = float(b0[2]);
 
  // b1
  r[6] = float(b1[0]);
  r[7] = float(b1[1]);
  r[8] = float(b1[2]);
 
  // r0-r2
  r[9] = float(d02[0]);
  r[10] = float(d02[1]);
  r[11] = float(d02[2]);
 
  // r0
  r[12] = float(s0[0]) - data.xbeam[0];
  r[13] = float(s0[1]) - data.ybeam[0];
  r[14] = float(s0[2]) - data.zbeam[0];
}

// Erase space point information
 
void SiSpacePointsSeedMaker::erase(EventData &data) 
{
  for (int i = 0; i < data.nrfz; ++i)
  {
    int n = data.rfz_index[i];
    data.rfz_map[n] = 0;
    data.rfz_ITkSorted[n].clear();
  }
 
  for (int i = 0; i < data.nrfzv; ++i)
  {
    int n = data.rfzv_index[i];
    data.rfzv_map[n] = 0;
    data.rfzv_ITkSorted[n].clear();
  }
 
  for (int i = 0; i < data.nr; ++i) {
    int n = data.r_index[i];
    data.r_map[n] = 0;
    data.r_ITkSorted[n].clear();
  }
 
  data.state = 0;
  data.nsaz = 0;
  data.nsazv = 0;
  data.nrfz = 0;
  data.nrfzv = 0;
  data.ns = 0;
  data.nr = 0;
}

// 2 space points seeds production
 
void SiSpacePointsSeedMaker::production2Sp(EventData &/*data*/) const
{
  ATH_MSG_WARNING("ITk::SiSpacePointsSeedMaker::production2Sp not implemented!");
}

// Production 3 space points seeds
 
void SiSpacePointsSeedMaker::production3Sp(EventData &data) const
{
  if (data.nsaz < 3)
    return;


  const std::array<int, arraySizeZ> zBinIndex_SSS{5, 6, 4, 7, 3, 8, 2, 9, 1, 10, 0};
  const std::array<int, arraySizeZ> zBinIndex_PPP_fast{0, 10, 1, 9, 2, 8, 5, 3, 7, 4, 6};
  const std::array<int, arraySizeZ> zBinIndex_PPP_long{0, 1, 2, 3, 10, 9, 8, 7, 5, 4, 6};
  const auto zBinIndex_PPP = m_fastTracking ? zBinIndex_PPP_fast : zBinIndex_PPP_long;
  // Fast tracking runs a single iteration, either pixel or strip
  // Default tracking runs a 0-th iteration for strip then a 1-st for pixel
  bool isPixel = (m_fastTracking && m_pixel) || data.iteration == 1;
  const auto zBinIndex = isPixel ? zBinIndex_PPP : zBinIndex_SSS;
 
  const float RTmax[11] = { 80., 200., 200., 200., 250., 250., 250., 200., 200., 200., 80.};
  const float RTmin[11] = { 40., 40., 70., 70., 70., 70., 70., 70., 70., 40., 40.};

  std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> iter_topCands;
  std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> iter_endTopCands;
  std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> iter_bottomCands;
  std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> iter_endBottomCands;
 
  int nPhiBins;
  std::array<int, arraySizePhiZ> nNeighbourCellsBottom{};
  std::array<int, arraySizePhiZ> nNeighbourCellsTop{};
  //coverity[STACK_USE]
  std::array<std::array<int, arraySizeNeighbourBins>, arraySizePhiZ> neighbourCellsBottom{};
  // Local variable neighbourCellsTop uses 79200 bytes of stack space,
  //coverity[STACK_USE]
  std::array<std::array<int, arraySizeNeighbourBins>, arraySizePhiZ> neighbourCellsTop{};
 
  if (isPixel)
  {
    nPhiBins = m_maxPhiBinPPP;
    nNeighbourCellsBottom = m_nNeighbourCellsBottomPPP;
    nNeighbourCellsTop = m_nNeighbourCellsTopPPP;
    neighbourCellsBottom = m_neighbourCellsBottomPPP;
    neighbourCellsTop = m_neighbourCellsTopPPP;
  }
  else
  {
    nPhiBins = m_maxPhiBinSSS;
    nNeighbourCellsBottom = m_nNeighbourCellsBottomSSS;
    nNeighbourCellsTop = m_nNeighbourCellsTopSSS;
    neighbourCellsBottom = m_neighbourCellsBottomSSS;
    neighbourCellsTop = m_neighbourCellsTopSSS;
  }

  int nseed = 0;
  data.endlist = true;

  for (int phiBin = data.fNmin; phiBin <= nPhiBins; ++phiBin)
  {

    int z = (m_fastTracking && m_pixel) ? 2 : 0;
    if (!data.endlist)
      z = data.zMin;

    for (; z < arraySizeZ; ++z)
    {
 
      if (m_fastTracking && m_pixel)
      {
        data.RTmax = RTmax[ zBinIndex[z] ];
        data.RTmin = RTmin[ zBinIndex[z] ];
      }
 
      int phiZbin = phiBin * arraySizeZ + zBinIndex[z];

      if (!data.rfz_map[phiZbin])
        continue;

      int numberBottomCells = 0;
      int numberTopCells = 0;

      for (int neighbourCellNumber = 0; neighbourCellNumber < nNeighbourCellsBottom[phiZbin]; ++neighbourCellNumber)
      {
 
        int theNeighbourCell = neighbourCellsBottom[phiZbin][neighbourCellNumber];
        if (!data.rfz_map[theNeighbourCell])
          continue;
        //cppcheck-suppress objectIndex; false positive
        iter_bottomCands[numberBottomCells] = data.rfz_ITkSorted[theNeighbourCell].begin();
        //cppcheck-suppress objectIndex; false positive
        iter_endBottomCands[numberBottomCells++] = data.rfz_ITkSorted[theNeighbourCell].end();
      }

      for (int neighbourCellNumber = 0; neighbourCellNumber < nNeighbourCellsTop[phiZbin]; ++neighbourCellNumber)
      {
 
        int theNeighbourCell = neighbourCellsTop[phiZbin][neighbourCellNumber];
        if (!data.rfz_map[theNeighbourCell])
          continue;
        //cppcheck-suppress objectIndex; false positive
        iter_topCands[numberTopCells] = data.rfz_ITkSorted[theNeighbourCell].begin();
        //cppcheck-suppress objectIndex; false positive
        iter_endTopCands[numberTopCells++] = data.rfz_ITkSorted[theNeighbourCell].end();
      }

      if (!data.trigger)
      {
        if (isPixel)
          production3SpPPP(data, iter_bottomCands, iter_endBottomCands, iter_topCands, iter_endTopCands, numberBottomCells, numberTopCells, nseed);
        else
          production3SpSSS(data, iter_bottomCands, iter_endBottomCands, iter_topCands, iter_endTopCands, numberBottomCells, numberTopCells, nseed);
      }
      else
        production3SpTrigger(data, iter_bottomCands, iter_endBottomCands, iter_topCands, iter_endTopCands, numberBottomCells, numberTopCells, nseed);
    }

    if (nseed >= m_maxsize)
    {
      data.endlist = false;
      data.fNmin = phiBin + 1;
      return;
    }
  }

  data.endlist = true;
}

// Production 3 pixel space points seeds for full scan
 
void SiSpacePointsSeedMaker::production3SpPPP(EventData &data,
                                              std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &iter_bottomCands,
                                              std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &iter_endBottomCands,
                                              std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &iter_topCands,
                                              std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &iter_endTopCands,
                                              const int numberBottomCells, const int numberTopCells, int &nseed) const
{


  std::vector<SiSpacePointForSeed *>::iterator iter_centralSP = iter_bottomCands[0];


  for (; iter_centralSP != iter_endBottomCands[0]; ++iter_centralSP)
  {
    if((*iter_centralSP)->radius() > data.RTmin) break;
  }

  iter_topCands[0] = iter_centralSP;
  ++iter_topCands[0];

  const float &ipt2K = data.ipt2K;
  const float &ipt2C = data.ipt2C;
  const float &COFK = data.COFK;
  const float &maxd0cut = m_maxdImpact;
  const float &zmax = data.zmaxU;
  const float &dzdrmax = data.dzdrmax;
  data.ITkCmSp.clear();

  size_t SPcapacity = data.ITkSP.size();

  for (; iter_centralSP != iter_endBottomCands[0]; ++iter_centralSP)
  {
    const float &R = (*iter_centralSP)->radius();
 
    if(R > data.RTmax)
      break;

    const float &X = (*iter_centralSP)->x();
    const float &Y = (*iter_centralSP)->y();
    const float &Z = (*iter_centralSP)->z();

    double absZ = std::abs(Z);
    if (!m_fastTracking && absZ > m_zmaxPPP)
      continue;
 
    float covr0 = (*iter_centralSP)->covr();
    float covz0 = (*iter_centralSP)->covz();
    float Ri = 1. / R;
    float ax = X * Ri;
    float ay = Y * Ri;
    float VR = maxd0cut / (R * R);
    size_t Ntm = 2;
    if (R > m_rmaxPPP)
      Ntm = 1;

    size_t Nt = 0;

    for (int cell = 0; cell < numberTopCells; ++cell)
    {
      std::vector<SiSpacePointForSeed *>::iterator iter_otherSP = iter_topCands[cell], iter_otherSPend = iter_endTopCands[cell];
      if (iter_otherSP == iter_otherSPend) continue;
 
      for(; iter_otherSP!=iter_otherSPend; ++iter_otherSP) {
        if(( (*iter_otherSP)->radius()- R ) >= m_drminPPP) break;
      } 
      iter_topCands[cell]=iter_otherSP; 

      for (; iter_otherSP != iter_endTopCands[cell]; ++iter_otherSP)
      {
        float Rt = (*iter_otherSP)->radius();
        float dR = Rt - R;
 
        const float dz = (*iter_otherSP)->z() - Z;
        const float dZdR = dz / dR;
        const float z0 = Z - R * dZdR;
        if (std::abs(z0) > zmax)
          continue;
 
        float dx = (*iter_otherSP)->x() - X;
        float dy = (*iter_otherSP)->y() - Y;
        float x = dx * ax + dy * ay;
        float y = dy * ax - dx * ay;
        float dxy = x * x + y * y;
        float r2 = 1. / dxy;
        float u = x * r2;
        float v = y * r2;
 
        if (std::abs(R * y) > maxd0cut * x)
        {
          float V0;
          y < 0. ? V0 = VR : V0 = -VR;
          float A = (v - V0) / (u + 1. / R);
          float B = V0 + A / R;
          if ((B * B) > (ipt2K * (1. + A * A)))
            continue;
        }
 
        const float dr = std::sqrt(r2);
        const float tz = dz * dr;
        if (std::abs(tz) > dzdrmax)
          continue;

        data.ITkSP[Nt] = (*iter_otherSP);
        data.R[Nt] = dr;                                                                                        
        data.U[Nt] = u;                                                                                         
        data.V[Nt] = v;                                                                                         
        data.Er[Nt] = ((covz0 + (*iter_otherSP)->covz()) + (tz * tz) * (covr0 + (*iter_otherSP)->covr())) * r2; 
        data.ITkSP[Nt]->setDR(std::sqrt(dxy + dz * dz));
        data.ITkSP[Nt]->setDZDR(dZdR);
        data.Tn[Nt].Fl = tz;
        data.Tn[Nt].In = Nt;

        if (++Nt == SPcapacity)
        {
          size_t increment = 50;
          data.resizeSPCont(increment, InDet::SiSpacePointsSeedMakerEventData::ToolType::ITk);
          SPcapacity = data.ITkSP.size();
        }
      } 
    }   
 
    if (Nt < Ntm)
      continue;

    size_t Nb = Nt;

    for (int cell = 0; cell < numberBottomCells; ++cell)
    {
 
      std::vector<SiSpacePointForSeed*>::iterator iter_otherSP = iter_bottomCands[cell];
 
      for(; iter_otherSP!=iter_endBottomCands[cell]; ++iter_otherSP) {
        if( (R - (*iter_otherSP)->radius()) <= m_drmaxPPP) break;
      }
      iter_bottomCands[cell]=iter_otherSP;

      for (; iter_otherSP != iter_endBottomCands[cell]; ++iter_otherSP)
      {
        const float &Rb = (*iter_otherSP)->radius();
        float dR = R - Rb;

        if (dR < m_drminPPP)
          break;
 
        const float dz = Z - (*iter_otherSP)->z();
        const float dZdR = dz / dR;
        const float z0 = Z - R * dZdR;
        if (std::abs(z0) > zmax)
          continue;
 
        float dx = (*iter_otherSP)->x() - X;
        float dy = (*iter_otherSP)->y() - Y;
        float x = dx * ax + dy * ay;
        float y = dy * ax - dx * ay;
        float dxy = ( x * x + y * y );
        float r2 = 1. / dxy;
        float u = x * r2;
        float v = y * r2;
 
        if (std::abs(R * y) > -maxd0cut * x)
        {
          float V0;
          y > 0. ? V0 = VR : V0 = -VR;
          float A = (v - V0) / (u + 1. / R);
          float B = V0 + A / R;
          if ((B * B) > (ipt2K * (1. + A * A)))
            continue;
        }
 
        const float dr = std::sqrt(r2);
        const float tz = dz * dr;
        if (std::abs(tz) > dzdrmax)
          continue;
 
    //Updated to 45mm for ITk layout 03-00-00
        if (m_fastTracking && (*iter_otherSP)->radius() < 45. && std::abs(tz) > 1.5)
          continue;

        data.ITkSP[Nb] = (*iter_otherSP);
        data.R[Nb] = dr;                                                                                        
        data.U[Nb] = u;                                                                                         
        data.V[Nb] = v;                                                                                         
        data.Er[Nb] = ((covz0 + (*iter_otherSP)->covz()) + (tz * tz) * (covr0 + (*iter_otherSP)->covr())) * r2; 
        data.ITkSP[Nb]->setDR(std::sqrt(dxy + dz * dz));
        data.ITkSP[Nb]->setDZDR(dZdR);
        data.Tn[Nb].Fl = tz;
        data.Tn[Nb].In = Nb;

        if (++Nb == SPcapacity)
        {
          size_t increment = 50;
          data.resizeSPCont(increment, InDet::SiSpacePointsSeedMakerEventData::ToolType::ITk);
          SPcapacity = data.ITkSP.size();
        }
 
      } 
    }   

    if (!(Nb - Nt))
      continue;
 
    sort(data.Tn,0,Nt);
    sort(data.Tn,Nt,Nb-Nt);
 
    data.nOneSeeds = 0;
    data.nOneSeedsQ = 0;
    data.ITkMapOneSeeds.clear();
    data.ITkMapOneSeedsQ.clear();

    size_t it0 = 0;
    for (size_t ib = Nt; ib < Nb; ++ib)
    {
 
      if (it0 == Nt)
        break;

      float Tzb = data.Tn[ib].Fl;       
      int b = data.Tn[ib].In;       
 
      float Rb2r = data.R[b] * covr0;
      float Rb2z = data.R[b] * covz0;
      float Erb = data.Er[b];        
      float Vb = data.V[b];          
      float Ub = data.U[b];          
      float Tzb2 = (1. + Tzb * Tzb); 
      float sTzb2 = std::sqrt(Tzb2); 
 
      float sigmaSquaredScatteringPtDependent = Tzb2 * COFK; 
      float sigmaSquaredScatteringMinPt = Tzb2 * ipt2C;      
      float d0max = maxd0cut;
 
      size_t Nc = 1;
      if (data.ITkSP[b]->radius() > m_rmaxPPP){
        Nc = 0;
      }
      if (data.nOneSeedsQ)
        ++Nc;

      for (size_t it = it0; it < Nt; ++it)
      {
 
        int t = data.Tn[it].In; // index of top seed after sorting
        float Tzt = data.Tn[it].Fl;


        float meanOneOverTanThetaSquare = Tzb * Tzt; // SSS uses arithmetic average, PPP geometric average

        float sigmaSquaredSpacePointErrors = Erb + data.Er[t]                                    
                                             + 2 * Rb2z * data.R[t]                              
                                             + 2 * Rb2r * data.R[t] * meanOneOverTanThetaSquare; // mixed term with r-uncertainy on central SP

        float remainingSquaredDelta = (Tzb - Tzt) * (Tzb - Tzt) - sigmaSquaredSpacePointErrors;

        if (remainingSquaredDelta - sigmaSquaredScatteringMinPt > 0)
        {
          if (Tzb - Tzt < 0.)
            break;
          it0 = it + 1 ;
          continue;
        }

 
        float dU = data.U[t] - Ub;
        if (dU == 0.)
          continue;
        float A = (data.V[t] - Vb) / dU;
        float onePlusAsquare = 1. + A * A;
        float B = Vb - A * Ub;
        float BSquare = B * B;

        if (BSquare > ipt2K * onePlusAsquare)
          continue;
        if (remainingSquaredDelta * onePlusAsquare > BSquare * sigmaSquaredScatteringPtDependent)
        {
          if (Tzb - Tzt < 0.)
            break;
          it0 = it;
          continue;
        }

        float d0 = std::abs((A - B * R) * R);

        if (d0 <= d0max)
        {
          float dr = data.R[b];
          if (data.R[t] < data.R[b])
            dr = data.R[t];
          data.ITkSP[t]->setScorePenalty(std::abs((Tzb - Tzt) / (dr * sTzb2)));
          data.ITkSP[t]->setParam(d0);

          data.ITkCmSp.emplace_back(B / std::sqrt(onePlusAsquare), data.ITkSP[t]);
          if (data.ITkCmSp.size() == 500)
            break;
        }
 
      } 
 
      if (data.ITkCmSp.size() > Nc)
      {
        newOneSeedWithCurvaturesComparisonPPP(data, data.ITkSP[b], (*iter_centralSP), Z - R * Tzb);
      }
      data.ITkCmSp.clear(); 
    }                        
    fillSeeds(data);
    nseed += data.fillOneSeeds;
 
  } 
}

 
void SiSpacePointsSeedMaker::production3SpSSS(EventData &data,
                                              std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &iter_bottomCands,
                                              std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &iter_endBottomCands,
                                              std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &iter_topCands,
                                              std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &iter_endTopCands,
                                              const int numberBottomCells, const int numberTopCells, int &nseed) const
{


  std::vector<SiSpacePointForSeed *>::iterator iter_centralSP = iter_bottomCands[0];
  std::vector<SiSpacePointForSeed *>::iterator iter_otherSP; 


  for (; iter_centralSP != iter_endBottomCands[0]; ++iter_centralSP)
  {
    if((*iter_centralSP)->radius() > data.RTmin) break;
  }

  iter_topCands[0] = iter_centralSP;
  ++iter_topCands[0];

  const float ipt2K = data.ipt2K;
  const float ipt2C = data.ipt2C;
  const float COFK = data.COFK;
  const float maxd0cut = m_maxdImpactSSS;
  const float zmax = data.zmaxU;
  data.ITkCmSp.clear();

  size_t SPcapacity = data.ITkSP.size();

  for (; iter_centralSP != iter_endBottomCands[0]; ++iter_centralSP)
  {
 
    const float &R = (*iter_centralSP)->radius();
    
    if(R > data.RTmax) break; 

    const float &X = (*iter_centralSP)->x();
    const float &Y = (*iter_centralSP)->y();
    const float &Z = (*iter_centralSP)->z();

    double absZ = std::abs(Z);
    if (absZ > m_zmaxSSS)
      continue;

    size_t Nt = 0;

    for (int cell = 0; cell < numberTopCells; ++cell)
    {
 
      for (iter_otherSP = iter_topCands[cell]; iter_otherSP != iter_endTopCands[cell]; ++iter_otherSP)
      {
        float Rt = (*iter_otherSP)->radius();
        float dR = Rt - R;
        if (dR >= m_drminSSS)
          break;
      }
      iter_topCands[cell] = iter_otherSP;

      for (iter_otherSP = iter_topCands[cell]; iter_otherSP != iter_endTopCands[cell]; ++iter_otherSP)
      {

        float Rt = (*iter_otherSP)->radius();
        float dR = Rt - R;
        if (dR > m_drmaxSSS)
          break;
 
        const float dz = (*iter_otherSP)->z() - Z;
        const float dZdR = dz / dR;

        const float z0 = Z - R * dZdR;
        if (std::abs(dz) > m_dzmaxSSS || std::abs(z0) > zmax)
          continue;

        if(m_isLRT){
          float Ri = 1./R;
          const float ax = X*Ri;
          const float ay = Y*Ri;
          float VR    = m_maxdImpact*Ri*Ri ;
          float dx = (*iter_otherSP)->x() - X;
          float dy = (*iter_otherSP)->y() - Y;
          float x = dx * ax + dy * ay;
          float y = dy * ax - dx * ay;
          
          if(std::abs(R*y) > maxd0cut * x) {
              float r2 = 1. / (x * x + y * y);
              float u   = x*r2        ;
              float v   = y*r2        ;
              const float V0 = (y < 0.) ? VR: -VR;
              float A   = (v-V0)/(u+Ri)          ;
              float B   = V0+A*Ri                ;
              if((B*B) > (ipt2K*(1.+A*A))) continue;
          }
        }

        data.ITkSP[Nt] = (*iter_otherSP);
        data.ITkSP[Nt]->setDZDR(dZdR);
        if (++Nt == SPcapacity)
        {
          data.resizeSPCont();
          SPcapacity = data.ITkSP.size();
        }
      } 
    }   

    if (!Nt)
      continue;

    size_t Nb = Nt;

    for (int cell = 0; cell < numberBottomCells; ++cell)
    {
 
      for(iter_otherSP=iter_bottomCands[cell]; iter_otherSP!=iter_endBottomCands[cell]; ++iter_otherSP) {
        if((R-(*iter_otherSP)->radius()) <= m_drmaxSSS) break;
      }  
      iter_bottomCands[cell]=iter_otherSP;

      for (; iter_otherSP != iter_endBottomCands[cell]; ++iter_otherSP)
      {

        const float &Rb = (*iter_otherSP)->radius();
        float dR = R - Rb;

        if (dR < m_drminSSS)
          break;
 
        const float dz = Z - (*iter_otherSP)->z();
        const float dZdR = dz / dR;

        const float z0 = Z - R * dZdR;
        if (std::abs(dz) > m_dzmaxSSS || std::abs(z0) > zmax)
          continue;

        if(m_isLRT){
          float Ri = 1./R;
          const float ax = X*Ri;
          const float ay = Y*Ri;
          float VR    = m_maxdImpact*Ri*Ri ;
          float dx = (*iter_otherSP)->x() - X;
          float dy = (*iter_otherSP)->y() - Y;
          float x = dx * ax + dy * ay;
          float y = dy * ax - dx * ay;
          
          if(std::abs(R*y) > -maxd0cut * x) {
              float r2 = 1. / (x * x + y * y);
              float u   = x*r2        ;
              float v   = y*r2        ;
              const float V0 = (y < 0.) ? VR: -VR;
              float A   = (v-V0)/(u+Ri)          ;
              float B   = V0+A*Ri                ;
              if((B*B) > (ipt2K*(1.+A*A))) continue;
          }
        }

        data.ITkSP[Nb] = (*iter_otherSP);
        data.ITkSP[Nb]->setDZDR(dZdR);
        if (++Nb == SPcapacity)
        {
          data.resizeSPCont();
          SPcapacity = data.ITkSP.size();
        }
      } 
    }   

    if (!(Nb - Nt))
      continue;

    float covr0 = (*iter_centralSP)->covr();
    float covz0 = (*iter_centralSP)->covz();

    float ax = X / R;
    float ay = Y / R;

    for (size_t i = 0; i < Nb; ++i)
    {
 
      SiSpacePointForSeed *sp = data.ITkSP[i];

      float dx = sp->x() - X;
      float dy = sp->y() - Y;
      float dz = sp->z() - Z;
      float x = dx * ax + dy * ay;
      float y = dy * ax - dx * ay;

      float r2 = 1. / (x * x + y * y);
      float dr = std::sqrt(r2);
      float tz = dz * dr;

      if (i >= Nt)
        tz = -tz;

      data.X[i] = x;
      data.Y[i] = y;
      data.Tz[i] = tz;                                                             
      data.Zo[i] = Z - R * tz;                                                     
      data.R[i] = dr;                                                              
      data.U[i] = x * r2;                                                          
      data.V[i] = y * r2;                                                          
      data.Er[i] = ((covz0 + sp->covz()) + (tz * tz) * (covr0 + sp->covr())) * r2; 
    }
 
    data.nOneSeeds = 0;
    data.nOneSeedsQ = 0;
    data.ITkMapOneSeeds.clear();
    data.ITkMapOneSeedsQ.clear();

    for (size_t b = Nt; b < Nb; ++b)
    {

      float Zob = data.Zo[b]; 
      float Tzb = data.Tz[b]; 
      float Rb2r = data.R[b] * covr0;
      float Rb2z = data.R[b] * covz0;
      float Erb = data.Er[b];        
      float Vb = data.V[b];          
      float Ub = data.U[b];          
      float Tzb2 = (1. + Tzb * Tzb); 
      float sTzb2 = std::sqrt(Tzb2); 
      float Se = 1. / std::sqrt(Tzb2);
      float Ce = Se * Tzb;
      float Sx = Se * ax;
      float Sy = Se * ay;
 
      float sigmaSquaredScatteringPtDependent = Tzb2 * COFK; 
      float sigmaSquaredScatteringMinPt = Tzb2 * ipt2C;      
      float d0max = maxd0cut;

      for (size_t t = 0; t < Nt; ++t)
      {

 
        // Trigger point
        //
        float dU0 = data.U[t] - Ub;
        if (dU0 == 0.)
          continue;
        float A0 = (data.V[t] - Vb) / dU0;
 
        float Cn = Ce * std::sqrt(1. + A0 * A0);
 
        float dn[3] = {Sx - Sy * A0, Sx * A0 + Sy, Cn};
        float rn[3];
        if (!(*iter_centralSP)->coordinates(dn, rn))
          continue;
 
        // Bottom  point
        //
        float B0 = 2. * (Vb - A0 * Ub);
        float Cb = 1. - B0 * data.Y[b];
        float Sb = A0 + B0 * data.X[b];
        float db[3] = {Sx * Cb - Sy * Sb, Sx * Sb + Sy * Cb, Cn};
        float rb[3];
        if (!data.ITkSP[b]->coordinates(db, rb))
          continue;
 
        // Top     point
        //
        float Ct = 1. - B0 * data.Y[t];
        float St = A0 + B0 * data.X[t];
        float dt[3] = {Sx * Ct - Sy * St, Sx * St + Sy * Ct, Cn};
        float rt[3];
        if (!data.ITkSP[t]->coordinates(dt, rt))
          continue;
 
        float xb = rb[0] - rn[0];
        float yb = rb[1] - rn[1];
        float zb = rb[2] - rn[2];
        float xt = rt[0] - rn[0];
        float yt = rt[1] - rn[1];
        float zt = rt[2] - rn[2];
 
        float rb2 = 1. / (xb * xb + yb * yb);
        float rt2 = 1. / (xt * xt + yt * yt);
 
        float tb = -zb * std::sqrt(rb2);
        float tz = zt * std::sqrt(rt2);


        float meanOneOverTanTheta = (tb + tz) / 2.;

        float sigmaSquaredSpacePointErrors = Erb + data.Er[t]                                                    
                                             + 2 * Rb2z * data.R[t]                                              
                                             + 2 * Rb2r * data.R[t] * meanOneOverTanTheta * meanOneOverTanTheta; // mixed term with r-uncertainy on central SP

        float remainingSquaredDelta = (tb - tz) * (tb - tz) - sigmaSquaredSpacePointErrors;

        if (remainingSquaredDelta - sigmaSquaredScatteringMinPt > 0)
          continue;
 
        float Rn = std::sqrt(rn[0] * rn[0] + rn[1] * rn[1]);
        float Ax = rn[0] / Rn;
        float Ay = rn[1] / Rn;
 
        float ub = (xb * Ax + yb * Ay) * rb2;
        float vb = (yb * Ax - xb * Ay) * rb2;
        float ut = (xt * Ax + yt * Ay) * rt2;
        float vt = (yt * Ax - xt * Ay) * rt2;
 
        float dU = ut - ub;
        if (dU == 0.)
          continue;
        float A = (vt - vb) / dU;
        float onePlusAsquare = 1. + A * A;
        float B = vb - A * ub;
        float BSquare = B * B;

        if (BSquare > ipt2K * onePlusAsquare || remainingSquaredDelta * onePlusAsquare > BSquare * sigmaSquaredScatteringPtDependent)
          continue;

        float d0 = std::abs((A - B * Rn) * Rn);

        if (d0 <= d0max)
        {
          float dr = std::sqrt(1 / rb2);
          if (data.R[t] < data.R[b])
            dr = std::sqrt(1 / rt2);
          data.ITkSP[t]->setScorePenalty(std::abs((tb - tz) / (dr * sTzb2)));
          data.ITkSP[t]->setParam(d0);
          float DR = std::sqrt( xt * xt + yt * yt + zt * zt ); // distance between top and central SP
          data.ITkSP[t]->setDR(DR);

          data.ITkCmSp.emplace_back(B / std::sqrt(onePlusAsquare), data.ITkSP[t]);
          if (data.ITkCmSp.size() == 500)
            break;
        }
 
      } 
      if (!data.ITkCmSp.empty())
      {
        newOneSeedWithCurvaturesComparisonSSS(data, data.ITkSP[b], (*iter_centralSP), Zob);
      }
    } 
    fillSeeds(data);
    nseed += data.fillOneSeeds;
 
  } 
}

// Production 3 space points seeds in ROI
 
void SiSpacePointsSeedMaker::production3SpTrigger(EventData &/*data*/,
                                                  std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &/*rb*/,
                                                  std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &/*rbe*/,
                                                  std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &/*rt*/,
                                                  std::array<std::vector<SiSpacePointForSeed *>::iterator, arraySizeNeighbourBins> &/*rte*/,
                                                  const int /*numberBottomCells*/, const int /*numberTopCells*/, int &/*nseed*/) const
{
   ATH_MSG_WARNING("ITk::SiSpacePointsSeedMaker::production3SpTrigger not implemented!");
}

// New 3 space points pro seeds
 
void SiSpacePointsSeedMaker::newOneSeed(EventData &data,
                                        SiSpacePointForSeed *&p1, SiSpacePointForSeed *&p2,
                                        SiSpacePointForSeed *&p3, float z, float seedCandidateQuality) const
{
  float worstQualityInMap = std::numeric_limits<float>::min();
  SiSpacePointsProSeed *worstSeedSoFar = nullptr;
  if (!data.ITkMapOneSeeds.empty())
  {
    std::multimap<float, SiSpacePointsProSeed *>::reverse_iterator l = data.ITkMapOneSeeds.rbegin();
    worstQualityInMap = (*l).first;
    worstSeedSoFar = (*l).second;
  }
  if (data.nOneSeeds < data.maxSeedsPerSP
      || (m_useSeedConfirmation && data.keepAllConfirmedSeeds && worstQualityInMap <= seedCandidateQuality && isConfirmedSeed(p1, p3, seedCandidateQuality) && data.nOneSeeds < data.seedPerSpCapacity)
      || (m_useSeedConfirmation && data.keepAllConfirmedSeeds && worstQualityInMap > seedCandidateQuality && isConfirmedSeed(worstSeedSoFar->spacepoint0(), worstSeedSoFar->spacepoint2(), worstQualityInMap) && data.nOneSeeds < data.seedPerSpCapacity))
  {
    data.ITkOneSeeds[data.nOneSeeds].set(p1, p2, p3, z);
    data.ITkMapOneSeeds.insert(std::make_pair(seedCandidateQuality, &data.ITkOneSeeds[data.nOneSeeds]));
    ++data.nOneSeeds;
  }

  else if (worstQualityInMap > seedCandidateQuality)
  {
    worstSeedSoFar->set(p1, p2, p3, z);
    std::multimap<float, SiSpacePointsProSeed *>::iterator
        i = data.ITkMapOneSeeds.insert(std::make_pair(seedCandidateQuality, worstSeedSoFar));
    for (++i; i != data.ITkMapOneSeeds.end(); ++i)
    {
      if ((*i).second == worstSeedSoFar)
      {
        data.ITkMapOneSeeds.erase(i);
        return;
      }
    }
  }
}
 
 
void SiSpacePointsSeedMaker::newOneSeedQ(EventData &data,
                                        SiSpacePointForSeed *&p1, SiSpacePointForSeed *&p2,
                                        SiSpacePointForSeed *&p3, float z, float seedCandidateQuality) const
{
  float worstQualityInMap = std::numeric_limits<float>::min();
  SiSpacePointsProSeed *worstSeedSoFar = nullptr;
  if (!data.ITkMapOneSeedsQ.empty())
  {
    std::multimap<float, SiSpacePointsProSeed *>::reverse_iterator l = data.ITkMapOneSeedsQ.rbegin();
    worstQualityInMap = (*l).first;
    worstSeedSoFar = (*l).second;
  }
  if (data.nOneSeedsQ < data.maxSeedsPerSP
      || (m_useSeedConfirmation && data.keepAllConfirmedSeeds && worstQualityInMap <= seedCandidateQuality && isConfirmedSeed(p1, p3, seedCandidateQuality) && data.nOneSeedsQ < data.seedPerSpCapacity)
      || (m_useSeedConfirmation && data.keepAllConfirmedSeeds && worstQualityInMap > seedCandidateQuality && isConfirmedSeed(worstSeedSoFar->spacepoint0(), worstSeedSoFar->spacepoint2(), worstQualityInMap) && data.nOneSeedsQ < data.seedPerSpCapacity))
  {
    data.ITkOneSeedsQ[data.nOneSeedsQ].set(p1, p2, p3, z);
    data.ITkMapOneSeedsQ.insert(std::make_pair(seedCandidateQuality, &data.ITkOneSeedsQ[data.nOneSeedsQ]));
    ++data.nOneSeedsQ;
  }

  else if (worstQualityInMap > seedCandidateQuality)
  {
    worstSeedSoFar->set(p1, p2, p3, z);
    std::multimap<float, SiSpacePointsProSeed *>::iterator
        i = data.ITkMapOneSeedsQ.insert(std::make_pair(seedCandidateQuality, worstSeedSoFar));
    for (++i; i != data.ITkMapOneSeedsQ.end(); ++i)
    {
      if ((*i).second == worstSeedSoFar)
      {
        data.ITkMapOneSeedsQ.erase(i);
        return;
      }
    }
  }
}
 
 

// New 3 space points pro seeds production
 
void SiSpacePointsSeedMaker::newOneSeedWithCurvaturesComparison(EventData &data, SiSpacePointForSeed *&SPb, SiSpacePointForSeed *&SP0, float Zob) const
{
  const float dC = .00003;
 
  bool pixb = !SPb->spacepoint->clusterList().second;
 
  std::sort(data.ITkCmSp.begin(), data.ITkCmSp.end(), comCurvature());
  std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator j, jn, i = data.ITkCmSp.begin(), ie = data.ITkCmSp.end();
  jn = i;
 
  for (; i != ie; ++i)
  {
    float u = (*i).second->param();
    bool pixt = !(*i).second->spacepoint->clusterList().second;
    if (pixt && std::abs(SPb->z() - (*i).second->z()) > m_dzmaxPPP)
      continue;
 
    const Trk::Surface *Sui = (*i).second->sur();
    float Ri = (*i).second->radius();
    float Ci1 = (*i).first - dC;
    float Ci2 = (*i).first + dC;
    float Rmi = 0.;
    float Rma = 0.;
    bool in = false;
 
    if (!pixb)
      u -= 400.;
    else if (pixt)
      u -= 200.;
 
    for (j = jn; j != ie; ++j)
    {
      if (j == i)
        continue;
      if ((*j).first < Ci1)
      {
        jn = j;
        ++jn;
        continue;
      }
      if ((*j).first > Ci2)
        break;
      if ((*j).second->sur() == Sui)
        continue;
 
      float Rj = (*j).second->radius();
      if (std::abs(Rj - Ri) < m_drmin)
        continue;
 
      if (in)
      {
        if (Rj > Rma)
          Rma = Rj;
        else if (Rj < Rmi)
          Rmi = Rj;
        else
          continue;
        if ((Rma - Rmi) > 20.)
        {
          u -= 200.;
          break;
        }
      }
      else
      {
        in = true;
        Rma = Rmi = Rj;
        u -= 200.;
      }
    }
    if (u > m_umax)
      continue;
 
    newOneSeed(data, SPb, SP0, (*i).second, Zob, u);
  }
  data.ITkCmSp.clear();
}
 
 
 
 

// Fill seeds
 
void SiSpacePointsSeedMaker::fillSeeds(EventData &data) 
{
  data.fillOneSeeds = 0;
 
  std::multimap<float, SiSpacePointsProSeed *>::iterator it_seedCandidate = data.ITkMapOneSeeds.begin();
  std::multimap<float, SiSpacePointsProSeed *>::iterator it_endSeedCandidates = data.ITkMapOneSeeds.end();
 
  if (data.nOneSeedsQ){
    it_seedCandidate  = data.ITkMapOneSeedsQ.begin();
    it_endSeedCandidates = data.ITkMapOneSeedsQ.end();
  }

  if (it_seedCandidate == it_endSeedCandidates)
    return;
 
  SiSpacePointsProSeed *theSeed{nullptr};

  for (; it_seedCandidate != it_endSeedCandidates; ++it_seedCandidate)
  {

    float quality = (*it_seedCandidate).first;
    theSeed = (*it_seedCandidate).second;

    if (!theSeed->setQuality(quality))
      continue;

    if (data.i_ITkSeedEnd != data.i_ITkSeeds.end())
    {
      theSeed = &(*data.i_ITkSeedEnd++);
      *theSeed = *(*it_seedCandidate).second;
    }
    else
    {
      data.i_ITkSeeds.emplace_back(*(*it_seedCandidate).second);
      //unused value, keep in comment to avoid repeating in future
      //theSeed = &(data.i_ITkSeeds.back()); 
      data.i_ITkSeedEnd = data.i_ITkSeeds.end();
    }
 
    ++data.fillOneSeeds;
  } 
}
 
const InDet::SiSpacePointsSeed *SiSpacePointsSeedMaker::next(const EventContext& ctx, EventData &data) const
{
  if (not data.initialized)
    initializeEventData(data, ctx);
 
  if (data.nspoint == 3)
  {
    do
    {
      if (data.i_ITkSeed == data.i_ITkSeedEnd)
      {
        findNext(data);
        //cppcheck-suppress identicalInnerCondition
        if (data.i_ITkSeed == data.i_ITkSeedEnd)
          return nullptr;
      }

    } while (!(*data.i_ITkSeed++).set3(data.seedOutput, 1./(1000. * data.K)));
    return &data.seedOutput;
  }
  else
  {
    if (data.i_ITkSeed == data.i_ITkSeedEnd)
    {
      findNext(data);
      //cppcheck-suppress identicalInnerCondition
      if (data.i_ITkSeed == data.i_ITkSeedEnd)
        return nullptr;
    }
    (*data.i_ITkSeed++).set2(data.seedOutput);
    return &data.seedOutput;
  }
  return nullptr;
}
 
bool SiSpacePointsSeedMaker::isZCompatible(EventData &data,
                       float Zv, float R, float T) const
{
  if (Zv < data.zminU || Zv > data.zmaxU)
    return false;
  if (!data.isvertex)
    return true;
 
  float dZmin = std::numeric_limits<float>::max();
  for (const float &v : data.l_vertex)
  {
    float dZ = std::abs(v - Zv);
    if (dZ >= dZmin)
      break;
    dZmin = dZ;
  }
  return dZmin < (m_dzver + m_dzdrver * R) * sqrt(1. + T * T);
}

// New space point for seeds
 
SiSpacePointForSeed *SiSpacePointsSeedMaker::newSpacePoint(EventData &data, const Trk::SpacePoint *const &sp) const
{
  std::array<float, 15> r;
  return newSpacePoint(data, sp, r, true);
}
 
SiSpacePointForSeed *SiSpacePointsSeedMaker::newSpacePoint(EventData &data, const Trk::SpacePoint *const &sp, std::span<float, 15> r, bool usePixStripInform) const
{
 
  SiSpacePointForSeed *sps = nullptr;

  convertToBeamFrameWork(data, sp, r.data());

  if (data.checketa)
  {
    float z = (std::abs(r[2]) + m_zmax);
    float x = r[0] * data.dzdrmin;
    float y = r[1] * data.dzdrmin;
    if ((z * z) < (x * x + y * y))
      return sps;
  }
 
  if (m_fastTracking)
  {
    float R2 = r[0] * r[0] + r[1] * r[1];
    // cotTheta=18.2855 corresponds to eta=3.6
    if (std::abs(r[2]) > m_dzMaxFast && R2 < m_R2MaxFast && std::abs(r[2]) < 18.2855 * std::sqrt(R2))
      return nullptr;
    if (std::abs(r[2]) - m_zmax > data.dzdrmax * std::sqrt(R2))
      return nullptr;
  }
 
  if (usePixStripInform)
  {
    if (!sp->clusterList().second)
      pixInform(sp, r.data());
    else
      stripInform(data, sp, r.data());
  }

  if (data.i_ITkSpacePointForSeed != data.l_ITkSpacePointForSeed.end())
  {
    sps = &(*data.i_ITkSpacePointForSeed++);
    sps->set(sp, r);
  }
  else
  {
    data.l_ITkSpacePointForSeed.emplace_back(sp, r);
    sps = &(data.l_ITkSpacePointForSeed.back());
    data.i_ITkSpacePointForSeed = data.l_ITkSpacePointForSeed.end();
  }
 
  return sps;
}

// New 2 space points seeds
 
void SiSpacePointsSeedMaker::newSeed(EventData &data,
                                     SiSpacePointForSeed *&p1, SiSpacePointForSeed *&p2, float z) 
{
  SiSpacePointForSeed *p3 = nullptr;
 
  if (data.i_ITkSeedEnd != data.i_ITkSeeds.end())
  {
    SiSpacePointsProSeed *s = &(*data.i_ITkSeedEnd++);
    s->set(p1, p2, p3, z);
  }
  else
  {
    data.i_ITkSeeds.emplace_back(p1, p2, p3, z);
    data.i_ITkSeedEnd = data.i_ITkSeeds.end();
  }
}
 
void SiSpacePointsSeedMaker::initializeEventData(EventData &data, const EventContext& ctx) const
{
  int seedArrayPerSPSize = (m_maxOneSizePPP > m_maxOneSizeSSS ? m_maxOneSizePPP : m_maxOneSizeSSS);
  if (m_alwaysKeepConfirmedStripSeeds || m_alwaysKeepConfirmedPixelSeeds)
    seedArrayPerSPSize = 50;
  data.initialize(EventData::ToolType::ITk,
                  m_maxsizeSP,
                  seedArrayPerSPSize,
                  0, 
                  m_nBinsR,
                  0, 
                  arraySizePhiZ,
                  arraySizePhiZV,
                  m_checketa);
 
  buildBeamFrameWork(data);

  double magField[3]{0, 0, 0};
  double globalPos[3] = {10., 10., 0.};
 
  MagField::AtlasFieldCache fieldCache;
  SG::ReadCondHandle<AtlasFieldCacheCondObj> readHandle{m_fieldCondObjInputKey, ctx};
  const AtlasFieldCacheCondObj *fieldCondObj{*readHandle};
  if (fieldCondObj == nullptr) {
    ATH_MSG_ERROR("ITk::SiSpacePointsSeedMaker: Failed to retrieve AtlasFieldCacheCondObj with key " << m_fieldCondObjInputKey.key());
    return;
  }
 
  fieldCondObj->getInitializedCache(fieldCache);
 
  if (fieldCache.solenoidOn()) {
    fieldCache.getFieldZR(globalPos, magField);
    data.K = 2. / (300. * magField[2]);
  } else {
    data.K = 2. / (300. * 5.);
  }

  data.ipt2K = m_ipt2 / (data.K * data.K);
  data.ipt2C = m_ipt2 * m_COF;
  data.COFK = m_COF * (data.K * data.K);
  data.bField[0] = magField[0];
  data.bField[1] = magField[1];
  data.bField[2] = magField[2];
 
}

// New 3 space points pro seeds production
 
void SiSpacePointsSeedMaker::newOneSeedWithCurvaturesComparisonSSS(EventData &data,
                                                                   SiSpacePointForSeed *&SPb, SiSpacePointForSeed *&SP0, float Zob) const
{
 
  if (m_useSeedConfirmation)
  {
    newOneSeedWithCurvaturesComparisonSeedConfirmation(data, SPb, SP0, Zob);
  }
 
  else
  {
 
    static const float curvatureInterval = .00003;

    if (data.ITkCmSp.size() > 2)
      std::sort(data.ITkCmSp.begin(), data.ITkCmSp.end(), comCurvature());
 
    std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_otherSP;
    std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_commonTopSP = data.ITkCmSp.begin(), ie = data.ITkCmSp.end();
    std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_startInnerLoop = it_commonTopSP;
 
    float Lt[4];

    for (; it_commonTopSP != ie; ++it_commonTopSP)
    {
 
      SiSpacePointForSeed *SPt = (*it_commonTopSP).second;
      int NT = 1;
      Lt[0] = SPt->dR();
      float seedIP = SPt->param();

      float minCurvature = (*it_commonTopSP).first - curvatureInterval;
      float maxCurvature = (*it_commonTopSP).first + curvatureInterval;

 
      for (it_otherSP = it_startInnerLoop; it_otherSP != ie; ++it_otherSP)
      {
        if (it_otherSP == it_commonTopSP)
          continue;
        if ((*it_otherSP).first < minCurvature)
        {
          it_startInnerLoop = it_otherSP;
          ++it_startInnerLoop;
          continue;
        }
        if ((*it_otherSP).first > maxCurvature)
          break;
 
        float L = (*it_otherSP).second->dR();
 
        int k = 0;
        for (; k != NT; ++k)
        {
          if (std::abs(L - Lt[k]) < 20.)
            break;
        }
        if (k == NT)
        {
          Lt[NT] = L;
          if (++NT == 4)
            break;
        }
      }
 
      // ITk seed quality used so far
      float Q = seedIP - float(NT) * 100.;
      if (NT > 2)
        Q -= 100000.;
      newOneSeed(data, SPb, SP0, SPt, Zob, Q);
    } 
    data.ITkCmSp.clear();
  }
}
 
void SiSpacePointsSeedMaker::newOneSeedWithCurvaturesComparisonPPP(EventData &data,
                                                                   SiSpacePointForSeed *&SPb, SiSpacePointForSeed *&SP0, float Zob) const
{
 
  if (m_useSeedConfirmation)
  {
    newOneSeedWithCurvaturesComparisonSeedConfirmation(data, SPb, SP0, Zob);
  }
 
  else
  {
 
    static const float curvatureInterval = .00003;

    if (data.ITkCmSp.size() > 2)
      std::sort(data.ITkCmSp.begin(), data.ITkCmSp.end(), comCurvature());
 
    std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_otherSP;
    std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_commonTopSP = data.ITkCmSp.begin(), ie = data.ITkCmSp.end();
    std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_startInnerLoop = it_commonTopSP;
 
    float Lt[4];
 
    float Qmin = 1.e20;
    float Rb = 2. * SPb->radius();
    int NTc(2);
    if (Rb > 280.) {
      NTc = 1;
    }
 
    SiSpacePointForSeed *SPmin = nullptr;
    bool Qm = Rb < 120. || std::abs(Zob) > 150.;

    for (; it_commonTopSP != ie; ++it_commonTopSP)
    {
 
      SiSpacePointForSeed *SPt = (*it_commonTopSP).second;
      int NT = 1;
      Lt[0] = SPt->dR();
      float seedIP = SPt->param();

      float minCurvature = (*it_commonTopSP).first - curvatureInterval;
      float maxCurvature = (*it_commonTopSP).first + curvatureInterval;

 
      for (it_otherSP = it_startInnerLoop; it_otherSP != ie; ++it_otherSP)
      {
        if (it_otherSP == it_commonTopSP)
          continue;
        if ((*it_otherSP).first < minCurvature)
        {
          it_startInnerLoop = it_otherSP;
          ++it_startInnerLoop;
          continue;
        }
        if ((*it_otherSP).first > maxCurvature)
          break;
 
        float L = (*it_otherSP).second->dR();
 
        int k = 0;
        for (; k != NT; ++k)
        {
          if (std::abs(L - Lt[k]) < 20.)
            break;
        }
        if (k == NT)
        {
          Lt[NT] = L;
          if (++NT == 4)
            break;
        }
      }
 
      int dN = NT - NTc;
      if (dN < 0 || (data.nOneSeedsQ && !dN))
        continue;
      if (Qm && !dN && seedIP > 1.)
        continue;
 
      // ITk seed quality used so far
      float Q = 100. * seedIP + (std::abs(Zob) - float(NT) * 100.);
      if (Q > SPb->quality() && Q > SP0->quality() && Q > SPt->quality())
        continue;
 
      if (dN)
        newOneSeedQ(data, SPb, SP0, SPt, Zob, Q);
      else if (Q < Qmin)
      {
        Qmin = Q;
        SPmin = SPt;
      }
    } 
    if (SPmin && !data.nOneSeedsQ)
      newOneSeed(data, SPb, SP0, SPmin, Zob, Qmin);
    data.ITkCmSp.clear();
  }
}
 
void SiSpacePointsSeedMaker::newOneSeedWithCurvaturesComparisonSeedConfirmation(EventData &data,
                                                                                SiSpacePointForSeed *&SPb, SiSpacePointForSeed *&SP0, float Zob) const
{
  static const float curvatureInterval = .00003;
  bool bottomSPisPixel = !SPb->spacepoint->clusterList().second;
  float bottomSPQuality = SPb->quality();
  float centralSPQuality = SP0->quality();

  if (data.ITkCmSp.size() > 2)
    std::sort(data.ITkCmSp.begin(), data.ITkCmSp.end(), comCurvature());
 
  float bottomR = SPb->radius();
  float bottomZ = SPb->z();
 
  std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_otherSP;
  std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_commonTopSP = data.ITkCmSp.begin(), ie = data.ITkCmSp.end();
  std::vector<std::pair<float, SiSpacePointForSeed *>>::iterator it_startInnerLoop = it_commonTopSP;

  for (; it_commonTopSP != ie; ++it_commonTopSP)
  {
 
    SiSpacePointForSeed *SPt = (*it_commonTopSP).second;
    float seedIP = SPt->param();
    float seedQuality = seedIP + SPt->scorePenalty();
    float originalSeedQuality = seedQuality;
 
    if (m_maxdImpact > 50)
    { //This only applies to LRT
 
      float topR = SPt->radius();
      float topZ = SPt->z();
 
      float Zot = std::abs(topR - bottomR) > 10e-9 ? bottomZ - (bottomR - originalSeedQuality) * ((topZ - bottomZ) / (topR - bottomR)) : bottomZ;
 
      float theta1 = std::abs(topR - bottomR) > 10e-9 ? std::atan2(topR - bottomR, topZ - bottomZ) : 0.;
      float eta1 = theta1 > 0 ? -std::log(std::tan(.5 * theta1)) : 0.;
 
      float theta0 = seedIP > 0 ? std::atan2(seedIP, Zot) : 0;
      float eta0 = theta0 > 0 ? -std::log(std::tan(.5 * theta0)) : 0.;
 
      float deltaEta = std::abs(eta1 - eta0); //For LLP daughters, the direction of the track is correlated with the direction of the LLP (which is correlated with the direction of the point of closest approach
      //calculate weighted average of d0 and deltaEta, normalized by their maximum values
      float f = std::min(0.5, originalSeedQuality / 200.); //0.5 and 200 are parameters chosen from a grid scan to optimize efficiency
      seedQuality *= (1 - f) / 300.;
      seedQuality += f * deltaEta / 2.5;
    }
 
    bool topSPisPixel = !SPt->spacepoint->clusterList().second;

    const Trk::Surface *surfaceTopSP = SPt->sur();
    float radiusTopSP = SPt->radius();
    float minCurvature = (*it_commonTopSP).first - curvatureInterval;
    float maxCurvature = (*it_commonTopSP).first + curvatureInterval;


    if (!bottomSPisPixel)
      seedQuality += m_seedScoreBonusSSS;
    else if (topSPisPixel)
      seedQuality += m_seedScoreBonusPPP;

 
    for (it_otherSP = it_startInnerLoop; it_otherSP != ie; ++it_otherSP)
    {
      if (it_otherSP == it_commonTopSP)
        continue;
      if ((*it_otherSP).first < minCurvature)
      {
        it_startInnerLoop = it_otherSP;
        ++it_startInnerLoop;
        continue;
      }
      if ((*it_otherSP).first > maxCurvature)
        break;
      if ((*it_otherSP).second->sur() == surfaceTopSP)
        continue;
      float radiusOtherSP = (*it_otherSP).second->radius();
      if (std::abs(radiusOtherSP - radiusTopSP) < m_drminSeedConf)
        continue;
      // if we have a confirmation seed, we improve the score of the seed.
      seedQuality += m_seedScoreBonusConfirmationSeed;
      // apply confirmation bonus only once
      break;
    }

    if (seedQuality > data.maxScore)
      continue;

    if (bottomSPisPixel != topSPisPixel)
    {
      if (seedQuality > 0. ||
          (seedQuality > bottomSPQuality && seedQuality > centralSPQuality && seedQuality > SPt->quality()))
        continue;
    }
    if (!isConfirmedSeed(SPb, SPt, seedQuality))
    {
      double maxdImpact = m_maxdImpact - (m_dImpactCutSlopeUnconfirmedPPP * SPt->scorePenalty());
      if (!bottomSPisPixel)
        maxdImpact = m_maxdImpactSSS - (m_dImpactCutSlopeUnconfirmedSSS * SPt->scorePenalty());
      if (seedIP > maxdImpact)
        continue;
    }
    newOneSeed(data, SPb, SP0, SPt, Zob, seedQuality);
  } 
  data.ITkCmSp.clear();
}
 
bool SiSpacePointsSeedMaker::isConfirmedSeed(const SiSpacePointForSeed *bottomSP,
                                             const SiSpacePointForSeed *topSP, float quality) const
{

  if (bottomSP->spacepoint->clusterList().second)
  {
    return (quality < m_seedScoreThresholdSSSConfirmationSeed);
  }
  else if (!topSP->spacepoint->clusterList().second)
  {
    return (quality < m_seedScoreThresholdPPPConfirmationSeed);
  }
  else
    return (quality < 0.);
}
 
void SiSpacePointsSeedMaker::writeNtuple(const InDet::SiSpacePointsSeed* seed, const Trk::Track* track, int seedType, long eventNumber) const
{
  if(m_writeNtuple) {
    std::lock_guard<std::mutex> lock(m_mutex);
 
    if(track != nullptr) {
      m_trackPt = (track->trackParameters()->front()->pT())/1000.f;
      m_trackEta = std::abs(track->trackParameters()->front()->eta());
    }
    else {
      m_trackPt = -1.;
      m_trackEta = -1.; 
    }
    m_d0           =   seed->d0();
    m_z0           =   seed->zVertex();
    m_eta          =   seed->eta();
    m_x1           =   seed->x1();
    m_x2           =   seed->x2();
    m_x3           =   seed->x3();
    m_y1           =   seed->y1();
    m_y2           =   seed->y2();
    m_y3           =   seed->y3();      
    m_z1           =   seed->z1();
    m_z2           =   seed->z2();
    m_z3           =   seed->z3();
    m_r1           =   seed->r1();
    m_r2           =   seed->r2();
    m_r3           =   seed->r3();
    m_type         =   seedType;
    m_dzdr_b       =   seed->dzdr_b();
    m_dzdr_t       =   seed->dzdr_t();
    m_pt           =   seed->pt();
    m_givesTrack   =   !(track == nullptr);
    m_eventNumber  =   eventNumber;
 
    // Ok: protected by mutex.
    TTree* outputTree ATLAS_THREAD_SAFE = m_outputTree;
    outputTree->Fill();
 
  }
 
}
 
bool SiSpacePointsSeedMaker::getWriteNtupleBoolProperty() const
{
  return m_writeNtuple;
}
 
} // namespace ITk