xAODEgamma → xAODPFlow Relation

File in Event/xAOD/xAODEgamma	Includes file in Event/xAOD/xAODPFlow
xAODEgamma / EgammaxAODHelpers.h	xAODPFlow / FlowElement.h
xAODEgamma / EgammaxAODHelpers.h	xAODPFlow / FlowElementContainer.h