egammaMonitoring::TruthPhotonHistograms Node1 egammaMonitoring::TruthPhoton Histograms + histo2DMap - m_cR_bins + initializePlots() + fill() + fill() + initializePlots() + fill() + fill() Node2 egammaMonitoring::Particle Histograms - m_hasFwd + initializePlots() + fill() + fill() + hasFwd() + IHistograms() + IHistograms() Node2->Node1 Node3 egammaMonitoring::IHistograms + histoMap # m_name # m_title # m_folder # m_rootHistSvc + IHistograms() + IHistograms() + initializePlots() + fill() + fill() + ~IHistograms() Node3->Node2