jet::AccessorAndHisto2< ATYPE1, ATYPE2, HTYPE > Node1 jet::AccessorAndHisto2 < ATYPE1, ATYPE2, HTYPE > # m_accessor2 # m_toGeV2 + AccessorAndHisto2() Node2 jet::AccessorAndHisto < ATYPE1, HTYPE > # m_accessor # m_h # m_toGeV1 + AccessorAndHisto() Node2->Node1