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Hi, I've made another check on residuals trying to decouple the 'core' contributions (events with only charged tracks or gammas from piz) and the 'tail' ones (other events). I've ran over brecovubmix for b0's. Those are three intresting plots: a) residuals for events with only charged tracks or gammas from piz http://www.slac.stanford.edu/~asarti/recoil/neu_stu/se_10_9.eps b) residuals for events with only charged tracks or two neutrals reconstructed (no matter were do they come) http://www.slac.stanford.edu/~asarti/recoil/neu_stu/se_6_9.eps c) residuals for events with at least one gamma reconstructed but with n(gamma) != 2 [it is the negation of point b] http://www.slac.stanford.edu/~asarti/recoil/neu_stu/sd_6_9.eps There are also the usual plots for mean and sigma of the core and tail gaussian fit to the residuals: b conditions) http://www.slac.stanford.edu/~asarti/recoil/neu_stu/se_9.eps c conditions) http://www.slac.stanford.edu/~asarti/recoil/neu_stu/sd_9.eps Few comments comparing: AA) http://www.slac.stanford.edu/~asarti/recoil/neu_stu/se_9.eps BB) http://www.slac.stanford.edu/~asarti/recoil/neu_stu/sd_9.eps we see that: 1) the resolution of the core gaussian in AA is much better than that in BB 2) the bias in the mean of the core gaussian is much more stable and little in AA than in BB Given that in the BAD we show a plot with the different contributions to the residual distribution do you think that this information is redundant , or it is needed in the BAD? Any comment or question is welcomed. Alessio ______________________________________________________ Alessio Sarti Universita' & I.N.F.N. Ferrara tel +39-0532-781928 Ferrara "Quod non fecerunt barbari, fecerunt Berlusconi" "Che il bianco sia bianco, e che il nero sia nero che uno e uno fanno due e che la scienza dice il vero.... DIPENDE !"