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Hoi Ric, discussions with Denis and Alessio have not solved my confusion about your killing function. I peeked into the gam lists and generator blocks of events with K0s->pi0pi0 in the old MC. The wrong bumps do not have a truth-match by virtue of the bug (I seem to remember this, and I have not found a single counter example). So either they are merged with the correct bump or we will never kill the proper one with the current setup. If the bad photons are merged with the correct one (this can be checked from the kinematics of the decay modulo resolutions since the correct photons have the link back to the mothers), killing is -- on an event by event basis -- not the right thing to do. Rescaling the energy would seem more appropriate. If they are not merged and the bad photons are still in the event, we should be able to find the best match to the K0S decay from the unmatched photons and throw out the correct ones. This amounts to the same as what is done in VubRemoveOrphans. I guess it would be good to understand why VubRemoveOrphans fails to remove them properly. Cheers, --U.