Hi, Reflections related by twin operator(s) should have same FreeR flag. FREERFLAG program in CCP4 takes care of it by default.
http://www.ccp4.ac.uk/html/freerflag.html > if the keyword NOTWIN is not set, all reflections that are equivalent > by the symmetry of the point group of the twin lattice (assuming the > data is twinned), obtain the same flag. This includes both the > possibility of merohedral and pseudomerohedral twinning. Best regards, Takanori Nakane (2014/07/07 7:31), Yamei Yu wrote:
Hi all, Is there anything that needed to pay attention to while choosing Rfree set for twinned data set? Or we can choose Rfree set randomly as untwined data set? Thanks! Best wishes! ************************************************ Yamei Yu
