TrigL2MuonSA::RpcLayerHits Node1 TrigL2MuonSA::RpcLayerHits + clear() Node2 std::vector< std::vector < double > > + elements Node2->Node1 +hits_in_layer_R +hits_in_layer_Z Node3 std::vector< std::list < double > > Node3->Node1 +hits_in_layer_phi +hits_in_layer_eta Node4 std::list< double > + elements Node4->Node3 +elements