Trk::DetailedTrackTruthCollection_p3::Entry Node1 Trk::DetailedTrackTruthCollection _p3::Entry Node2 Trk::DetailedTrackTruth_p3 Node2->Node1 +detailedTruth Node3 Trk::TruthTrajectory_p2 Node3->Node2 +m_trajectory Node4 std::vector< HepMcParticle Link_p2 > Node4->Node3 Node5 T Node5->Node4 +elements Node6 Trk::SubDetHitStatistics_p0 + numPRDs Node6->Node2 +m_hitsTrack +m_hitsCommon +m_hitsTruth Node7 Trk::TrackTruthKey_p0 + m_index + TrackTruthKey_p0() + TrackTruthKey_p0() Node7->Node1 +key