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Hoi Alessio, I had a look at the logfiles. We have the following message BtaMcAssoc::mcFromRecoNeutTrk. mc candidate associate to a reco neutral does not exist. in both SP3 and SP4. The level is very different though. For two randomly chosen logfile with 40k events each, I see SP4: 9876 SP3: 3486 occurences, i.e. SP4 is three times more affected by this. I gather from CompositionUtils/CompBaseNtpDump.cc that we use "Default" as microMap, not the GHit-based. Is this right? I'd consider this a bug and not a feature. Daniele or Ric, could you comment on this, please? As for the K0S: Did you filter out events with K0S->pi0pi0 only, or also those with K0S->pi+pi-? It seems that the difference between the two events classes is larger for SP3 than for SP4. Cheers, --U.