This reorganizes the structure significantly. JetHists.cxx now contains code for dealing with the xAOD::JetContainer objects such as AntiKt10LCTopo, AntiKt10Truth, and so on. HistogramManager.h is a generic class that can be used to add one-off histograms within an EventLoop algorithm. It doesn't require much in the way of information, but has extra add-ons to be useful. JetHists extends HistogramManager by combining common histograms for xAOD::Jet into a single package which can then be loaded onto JetKinematics.cxx for example. makeJetKinematics.cxx provides how one might run it.