Hi Sergei, such fine slicing during data collection would suggest a large cell. How many reflections are you merging? And what is the redundancy (in the expected symmetry)? Rmerge tends to go up with more reflections added.
Peter On 5 Nov 2010, at 08:40, Sergei Strelkov wrote: > Dear All, > > I am processing a dataset collected (not by me) with 0.1 degree > oscillations. > The diffraction is quite weak even though there is a clean diffraction > pattern to about 3A. > > Either Mosflm or XDS processes the data readily with +/- default settings > but both yield a high overall Rmerge of about 0.23 in the expected symmetry. > Processing in P1 yields an overall Rmerge of ~0.18, but what is > especially disappointing > is that Rmerge is as high as 0.15 at ~5A resolution already. > > The question is, how can we process the data so that the merging statistics > becomes more reasonable? > > Apparent mosaicity turns out to be ~0.5A. My naive way of thinking is > to try treating each five consecutive frames as a single 0.5 degree frame. > Does anyone have experience with this? > > Many thanks in advance, > Sergei
