TrigTrackCounts_p2 Node1 TrigTrackCounts_p2 + TrigTrackCounts_p2() + ~TrigTrackCounts_p2() Node2 TrigHisto2D_p1 + m_nbins_x + m_min_x + m_max_x + m_nbins_y + m_min_y + m_max_y + TrigHisto2D_p1() Node2->Node1 -m_eta_phi -m_z0_pt Node3 std::vector< float > + elements Node3->Node2 +m_contents