Dear All, I am trying to refine my model against a higher resolution dataset. My colleage's old-low resolution dataset was processed in HKL/scalepack and the FreeR was assigned by Phenix.reflection file editor, which I assume the test set was marked as "1". Now I got a new-higher resolution dataset, and plan to process it in XDS/Aimless. I want to transfer the FreeR set from his old mtz and also use his low res model for the new refinement. My question is, when I transfer the FreeR set from his old mtz with flag value as "1" in Aimless, is the flag value now "1" or "0" in the new mtz output by Aimless? Can Aimless recognize the FreeR flag from the old mtz which are marked as "1"? I also read an old post from Nat Echols in 2011: "For Phenix, 1 is test, 0 is work, but you could reverse this and it will still figure out what to do automatically", so does it mean it doesn't matter if the FreeR is "1" or "0" in the mtz from Aimless, if I use phenix.refine for my new dataset, Phenix can figure out which is the correct FreeR value? It's a mix of CCP4 and Phenix question, so I have crossed posted it in the CCP4bb as well. Many thanks, Matt