AthExParticles_p1 Node1 AthExParticles_p1 + AthExParticles_p1() Node2 std::vector< AthExParticle_p1 > Node2->Node1 #m_particles Node3 AthExParticle_p1 + m_px + m_py + m_pz + m_ene + AthExParticle_p1() Node3->Node2 +elements