Jackie, please note that (at least imho) the desire to obtain "better" R-factors does not justify excluding data from analysis. Weak reflections that you suggest should be rejected contain information, and excluding them will indeed artificially lower the R-factors while reducing the accuracy of your model.
Cheers, Ed. On Mon, 2010-10-25 at 17:44 -0400, Jacqueline Vitali wrote: > Also if your Rmerge is high and you include all reflections in > refinement, Rfree is high. In my experience, by excluding F < sigma > reflections you drop Rfree a lot. -- "I'd jump in myself, if I weren't so good at whistling." Julian, King of Lemurs