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Hi, Clare just pointed me to the Recipe for using GHit based matching in CM2 analyses http://www.slac.stanford.edu/BFROOT/www/Computing/Offline/AnalysisTools/TruthMatching/TruthMatching.html where it says at the bottom NB: Occassionally, the GTrack constributing to your reco candidate will not be associated to a MC BtaCandidate. In these cases, the pointer returned (mc in the code above) will be NULL. However, the consistency will still be valid since the GTrack did constribute to the reco information. That is exactly the message we get, right? Furthermore, the MC block seems to be filled alright, the breakdown of our background into the various truth categories is very similar to what we saw before. Cheers, Henning