HistoGroupBase::HistData Node1 HistoGroupBase::HistData + interval Node2 std::string Node2->Node1 +path Node3 std::basic_string< char > Node3->Node2 Node4 TH1 + Fill() + Fill() + Fill() + GetBinContent() + GetBinContent() + GetBinContent() + SetBinContent() + SetBinContent() + SetBinContent() + SetBinError() + SetBinError() + SetBinError() + Sumw2() Node4->Node1 +hist