Dear all I am confusing the choose of free R-flags recently. Rfactor means calculatted from reflection not used in refinement,so what's big the difference between different percentage of R-flags,like it's about 5% in ccp4 -refmac, while it is 10% in phenix-refinement,what's the difference between them and how they affect the Rwork and Rfree values when do refinement. Thanks a lot ! best regards shijun ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1