FakeBkgTools::Yield Node1 FakeBkgTools::Yield   + add() + add() + stat() + syst() Node2 FakeBkgTools::Efficiency + nominal + value() + add() + multiply() + multiply() + setToConst() + subFromOne() Node2->Node1 Node3 std::map< uint16_t, FakeBkgTools::Uncertainty > + keys   Node3->Node2 +uncertainties Node4 FakeBkgTools::Uncertainty + up + down + Uncertainty() + Uncertainty() + operator+=() + operator+() + operator*=() + operator*=() Node4->Node1 +stat2 Node4->Node3 +elements