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Hi all, I have updated my web page http://www.slac.stanford.edu/~petrella/mesfits/mesfits.html with the latest studies on Thorsten's signal pdf. I used only Thorsten's signal pdf to fit signal MC. Here the bias (defined as number of entries in histogram - number of events fitted) is very little. Then I fitted all MC adding the argus and crystall ball to describe the background. In this case the bias is higher, outside the 1 sigma error, but not as large as when I tried with gauz as signal PDF. The fit on data doesn't look good, probably I have to relax some parameters. I also looked at the chisquared scaling: most probably something is wrong since the fit gives back the same values when I use different multiplying error factors. Any suggestions? Ciao Antonio