FPGATrackSimMatrixWriter Node1 FPGATrackSimMatrixWriter - m_nEntries - m_nLayers - m_nCoords - m_nCoords2 - m_coverage + FPGATrackSimMatrixWriter() + fill() Node2 std::vector< short > + elements Node2->Node1 -m_pphi -m_pQoP -m_peta -m_bins_d0 -m_pz0 -m_bins_phi -m_bins_QoP -m_bins_eta -m_pd0 -m_bins_z0 ... Node3 TTree Node3->Node1 -m_tree