Hoi Daniele, as announced in my commit message a while ago, my perl script is in ~ursl/perl/mkCheckedChain, it needs a macro ~ursl/macros/checkChain.C. Alessio has all of this. I am not sure whether he committed it, I could not find any message. http://www.slac.stanford.edu/BFROOT/www/Physics/Analysis/AWG/InclusiveSL/islrecoil/chains/ contains the subdirectories with the official chains. In there you'll find official "checked" chains for signal cocktail data generic b generic c generic uds They have been produced by Alessio and partly myself. They are not the same as my old chains, because Alessio has included more of the unskimmed MC. (My checked chains are in the place you looked, e.g. csx-genbch-2000.) I am currently h2root'ing Alessio's hbook files of the 'new' (OBJY unskimmed) batch, after Henning has tranferred his hbook files to their final destination I'll do the same for his batch. He is currently transfering, if you'd like to monitor the progress, look at /nfs/farm/babar/AWG23/ISL/henning/sx-080702/unskgenbb/output/generic_bch/. Once I have done that I will produce updated chains and updated checked chains. It will take a while. I am not sure whether producing the files on your own will speed up things at the current stage. Note that Alessio is at the moment thrashing AWG18 with the skimming jobs (it's basically just I/O). You will not get much I/O from it before they are done. Cheers, --U.