SiHit_p1 Node1 SiHit_p1 + m_stX + m_stY + m_stZ + m_enX + m_enY + m_enZ + m_energyLoss + m_meanTime + m_ID Node2 HepMcParticleLink_p1 # m_mcEvtIndex + HepMcParticleLink_p1() + HepMcParticleLink_p1() Node2->Node1 +m_partLink Node3 long Node3->Node2 #m_barcode