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Daniele reported in http://www.slac.stanford.edu/cgi-bin/lwgate/VUB-RECOIL/archives/vub-recoil.200208/Author/article-6.html the problem we found the other day: some of the candidates get less photons rejected than expected from photon counting. I have scanned through a good deal of the events with twomissing photons and they all came from merged pi0s. This can be checked because merged pi0s have dxB0Index==-1. the only problem is that the overlap fails for merged pi0s because the are clusters while the photon list is made of calorNeutral. I will have to fix the overlap function in IbuNtpDump to overcome this problem. ciao ric