LArTTCell_P Node1 LArTTCell_P + m_version + LArTTCell_P() + ~LArTTCell_P() Node2 std::vector< LArTTCell _P::LArTTCell_P_t > Node2->Node1 +m_v Node3 LArTTCell_P::LArTTCell_P_t + tpn + tsample + tregion + teta + tphi + layer + det + pn + sample + region + eta + phi Node3->Node2 +elements