Dear all, I am refining a structure with phenix.refine using a .mtz which contains F/SigF and DF/SigDF (CCP format from xdsconv) and i have something like 10000 unique reflections. The test set was created with the uniqueify script. If I understand correctly in the manual it is written that phenix.refine will separate the <F>/<SigF> into "F(+) SIGF(+) F(-) SIGF(-)), instead of keeping the original non-anomalous amplitudes". My question is about the "FREE R VALUE TEST SET COUNT" in the .pdb after phenix.refine. If I understand correctly the number for the test set will also be "doubled" because the <F> will be separated into F+ F-? Logically both F+/F- after separation are kept in the test set is this right? And an impair number for the test set in this case means that only the F+ OR F- was observed? Sorry if I ask a trivial question but I just want to be sure I am using the program in the right way Thanks in advance Filip