ROIPhiRZContainer Node1 ROIPhiRZContainer + hasMatchingROI() + lowerPhiBound() + addROI() + sort() + eta() + theta() + phi() # sqr() # deltaEta() # order() # lowerPhiBound() # hasMatchingROI() Node2 std::vector< ROIPhiRZ > Node2->Node1 Node3 T Node3->Node2 +elements