Re: [ccp4bb] Tweaking with SCBUlk and BBULk parameters in refmac

2007-08-06 Thread Eleanor Dodson
Well - this (expert??) would suggest using SCALE SIMPLE - SCBULK is a fudge which has some theoretical justification if you have measured very complete and accurate low resolution data, but seeing most people havent done this it remains a fudge factor The justification is related to average

[ccp4bb] Tweaking with SCBUlk and BBULk parameters in refmac

2007-08-03 Thread Jose Antonio Cuesta-Seijo
Dear All, I have a structure to 1.65A crystallized in high sulphate conditions. The R factors went smoothly to 21% and 23% (Rfree), but the difference map shows positive difference peaks in otherwise normal regions of the main chain and is more noisy than expected in general. Since the