FakeBkgTools::Efficiency Node1 FakeBkgTools::Efficiency + nominal + uncertainties + value() + add() + multiply() + multiply() + setToConst() + subFromOne() Node2 FakeBkgTools::Weight + syst() Node1->Node2 Node3 FakeBkgTools::Yield + stat2 + add() + add() + stat() + syst() Node1->Node3