StandaloneL1TopoHistSvc Node1 StandaloneL1TopoHistSvc - m_impl + StandaloneL1TopoHistSvc() + ~StandaloneL1TopoHistSvc() + registerHist() + registerHist() + findHist() + fillHist1D() + fillHist2D() + setBaseDir() + save() Node2 IL1TopoHistSvc + registerHist() + registerHist() + findHist() + fillHist1D() + fillHist2D() + setBaseDir() + save() Node2->Node1