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Hi all, I have a few datasets that I think are twinned for several reasons. 1)The Rfree and Rmerge are both stuck very high. 2) The L-test for twinning in Scala shows twinning 3) Also the centric and acentric movements suggest twinning. 4) The spots do not match the predication from Mosflm (Non-merohedral twinning ?) The space group is p212121, and am able to solve the structure using MR. But when its comes to refining the Rfact and Rfree are stuck at high values (for one of them at a resolution of 1.65 A they are 0.32 and 0.36 respectively ) Any suggestions how i could deal with these datasets ? Many thanks Rana