Trk::Track_p4 Node1 Trk::Track_p4 + m_fitter + m_particleHypo + m_properties + m_patternRecognition + m_extPatternRecognition + m_chiSquared + m_numberDoF + Track_p4() Node2 std::vector< TPObjRef > Node2->Node1 +m_trackState Node3 TPObjRef # m_index + TPObjRef() + TPObjRef() + isNull() + typeID() + topLevelCnvID() + index() Node3->Node2 +elements Node4 TPObjRef::typeID_t + m_TLCnvID + m_cnvID + typeID_t() + topLevelCnvID() + cnvID() + value() + isNull() Node4->Node3 #m_typeID