Hi all, I repeated the comparison data-generic MC with a different selection on neutrals and charged tracks. GTVL = Good track very loose GPL = Good photon loose the table of plots is in http://www.slac.stanford.edu/~daniele/vub/GTVL_GPL.html and you can compare with the first column in the table in the page http://www.slac.stanford.edu/~daniele/vub/disagree.html for the usual selction (charged tracks + Alessio's neutral selection) What I notice is the following mm2: large improvement after lepton cut small improvement after all cuts mxhad: still bad after lepton cut (MC shift, data unchanged) - after all cuts (I have to fix this plot) mxhadfit: level of comparison almost unchanged As far as these three variables are concerned it seems that the data do not change so much while the MC has a dramatic change (between the original and the new selection) BUT I see very bad comparison in the total number of NEUTRALS nad CHARGED TRACKS. Again MC change dramatically. The total charge plot is pretty different than before. Now the bin at zero has more entries in data (before was in MC). Urs, do you confirm my observations? Daniele