MuonDQAHistList Node1 MuonDQAHistList + clear() + addHist() + addHist() + getH1() + getH2() Node2 std::vector< TH2 * > Node2->Node1 -m_H2s Node3 TH2 + Fill() + Fill() + Fill() + Fill() + Fill() Node3->Node2 +elements Node4 std::vector< TH1 * > Node4->Node1 -m_H1s Node5 TH1 + Fill() + Fill() + Fill() + GetBinContent() + GetBinContent() + GetBinContent() + SetBinContent() + SetBinContent() + SetBinContent() + SetBinError() + SetBinError() + SetBinError() + Sumw2() Node5->Node4 +elements