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Dear Jarrod, did you inspect the images if you can see multiple lattices? in case of pseudo-merohedral twinning you would best look at high resolution reflections. What do you mean by 'but these will not refine Rfree'? Did you try twin refinement with refmac5? Best, Tim On Sunday, March 13, 2016 11:56:50 PM Jarrod Mousa wrote: > Hi all, > > I have two data sets for a protein that both index and scale into P212121 > and process easily in imosflm, yet AIMLESS and Xtriage suggest twinning, > although no laws fit P212121. I tried indexing into P1 and Xtriage finds > three possible pseudo-merohedral twin laws h-k-l, -h,k-l, and -h,-k,l. I > can find solutions easily in Phaser, but these will not refine Rfree. I am > wondering what the best approaches are to find the correct spacegroup and > try to solve the structure correctly? > > thanks, > > Jarrod Mousa -- -- Paul Scherrer Institut Dr. Tim Gruene - persoenlich - OFLC/102 CH-5232 Villigen PSI phone: +41 (0)56 310 5297 GPG Key ID = A46BEE1A