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Hi, I tend to disagree with this interpretation: The functional dependence seems to stay the same. The fact that we don't see anymore a peak in the second bin at high IP cuts is due to the very large error in the first bin. The data seem to be consistent with having a peak in the second bin, although one can only claim the one or the other interpretation if the uncorrelated errors are taken in to account. I could also argue that we don't have a peak in the second bin also for small IP but an unlucky downward statistical fluctuation in the first bin. Fact is that this peak-like structure influences our capability to parametrize the functional dependence of our (S/P) fix. In this sense higher IP cuts could help us but we need to see the trade-off between simplification and higher statistical errors in the individual bins. Cheers, Heiko On Wed, 13 Sep 2006, Chukwudi Kweku Clarke wrote: > Hi all, Kerstin noted something of interest in Antonio's talk. Please see > http://www.slac.stanford.edu/~clarke1/protected/clarke1/IPartifactVVF.pdf > Cheers, C.C. >