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Hi, I don't think XDS generates an Rpim value, does it? The XDS CORRECT strep provides the "old fashioned" Rsym (R-FACTOR) plus R-meas and Rmrgd-F. The curves look all the same though Fred. Ed Pozharski wrote: > On Thu, 2011-03-03 at 16:02 +0100, Vellieux Frederic wrote: > >> For myself, I decide on the high resolution cutoff by looking at the >> Rsym vs resolution curve. The curve rises, and for all data sets I >> have >> processed (so far) there is a break in the curve and the curve shoots >> up. To near vertical. This "inflexion point" is where I decide to >> place >> the high resolution cutoff, I never look at the I/sigma(I) values nor >> at >> the Rsym in the high resolution shell. >> >> > > Fred, > > while your procedure is definitely more sophisticated than what I do, > let me point out that the Rsym is genuinely a bad measure for this, as > it depends strongly on redundancy. Does more robust measures (e.g. > Rpim) show similar "inflexion"? I suspect it will at least shift > towards higher resolution. > > Cheers, > > Ed. > >