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Hi, I've spent a lot of time fighting today against root, but some results are now available. You can find an update on the gamma's energy spectrum in the webpage: http://www.slac.stanford.edu/~asarti/recoil/neu_stu/ The study of the residuals is still ongoing.. The most important thing is the following: I've investigated the reason of such different spectra for sp3 and sp4 for neutrals that were not matched to the B and I've found a strange behavior of the isAncestor function that does the matching btw a particle and an hypotetical mother... Doing the matching 'by hand' I got results that are meaningful and quite in agreement for sp3 and sp4 (as you can see in the first links to the B matched and unmatched photons results). But if I switch to use the isAncestor function i loose a lot of B candidates and some differences in the unmatched spectra start to arose. The good news is that the plots I've shown in the last meeting were due to a bug in the way I was calling the function that now is fixed: so still using isAncestor to investigate the MC tree leads to much more compatible results for sp3 and sp4.... More study on the isAncestor function is ongoing (maybe i'm still doing something dumb..) but it seems to me that the differences tdw sp3 and sp4 are now becoming much more smaller... Any question or comment 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 !"