Trk::Track_p12 Node1 Trk::Track_p12 + m_author + m_particleHypo + Track_p12() Node2 Trk::FitQuality_p1 + m_chiSquared + m_numberDoF + FitQuality_p1() Node2->Node1 +m_fitQuality Node3 std::vector< TPObjRef > Node3->Node1 +m_trackState Node4 TPObjRef # m_index + TPObjRef() + TPObjRef() + isNull() + typeID() + topLevelCnvID() + index() Node4->Node3 +elements Node5 TPObjRef::typeID_t + m_TLCnvID + m_cnvID + typeID_t() + topLevelCnvID() + cnvID() + value() + isNull() Node5->Node4 #m_typeID