[ccp4bb] How many reflections per shell for good statistics - data processing

[Jorge Iulek]

Dear all,     Is there any study to recommend the (minimum) number of reflections for adequate statistics in each shell during image processing? I mean, for indexes like R_meas or R_symm or CC1/2, it might be important to know the number of total reflections and unique reflections in the shell, maybe these numbers might be different for indexes like <I/sigI>. I am not properly talking about the best index here, yet there have been many indications that CC1/2 should be a preferred one, but rather, how thin can the shell be (id est, related to the number of bins we should consider better according to the resolution).     I have yet other question, a kind of related one. But I will prefer to separate (and the discussion thus derived) in other email.     Thanks, Jorge