Allow OutputAnalysisConfig to retrieve custom MET terms
CP::AsgxAODMetNTupleMakerAlg
has a property termName
to select which of the MET terms to save to file. The default value of "Final" is the one most people will want, but it should nonetheless be exposed to allow for user choice. For instance, at truth-level, the "NonInt" term is preferred, see Run2xAODMissingET.