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Dear Rakesh, dear Artem, Since the initial question is not precise (which kind of comments are expected?) I may mention that the most frequent values of R, Rfree and DeltaR (that is asked about) are given in our work published in 2009 in Acta Cryst., D65, 1283-1291. Interestingly, they are practically linear functions of log(resolution). The plots show also the statistics of deviation from these lines. Best regards, Sacha Urzhumtsev Universities of Strasbourg & Nancy De : CCP4 bulletin board [mailto:[log in to unmask]] De la part de Artem Evdokimov Envoyé : mardi 26 octobre 2010 03:36 À : [log in to unmask] Objet : Re: [ccp4bb] diverging Rcryst and Rfree http:[log in to unmask] as well as some notes in the older posts :) As a very basic rule of thumb, Rfree-Rwork tends to be around Rmerge for the dataset for refinements that are not overfitted. Artem On Mon, Oct 25, 2010 at 4:10 PM, Rakesh Joshi <[log in to unmask]<mailto:[log in to unmask]>> wrote: Hi all, Can anyone comment, in general, on diverging Rcryst and Rfree values(say>7%) for structures with kind of low resolutions(2.5-2.9 angstroms)? Thanks RJ