Here is a list of all variables with links to the classes they belong to:

m_unitI : EvtBLLNuLAmp
m_upperRange : EvtItgAbsFunction
m_Upsilon : EvtBLLNuLAmp
m_useBirthFact : EvtMassAmp
m_useBirthFactFF : EvtMassAmp
m_useDeathFact : EvtMassAmp
m_useDeathFactFF : EvtMassAmp
m_useEvtGenRandom : EvtExternalGenList, EvtPHOTOS, EvtPythiaEngine, EvtSherpaPhotons, EvtTauolaEngine
m_useME : EvtSherpaPhotons
m_usePhsp : EvtFlatQ2
m_userSetBirthOthD : EvtAbsLineShape
m_userSetBirthPar : EvtAbsLineShape
m_userSetBirthPW : EvtAbsLineShape
m_userSetPW : EvtAbsLineShape
m_userSetPWD1 : EvtAbsLineShape
m_userSetPWD2 : EvtAbsLineShape