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Originally posted by lxwnny at 2011-04-28 21:04:49:
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x can be refined at the same time as all the other parameters using the TWIN instruction with the default matrix R = (-1 0 0, 0 -1 0, 0 0 -1) and BASF with one parameter (x); this implies racemic twinning and so is refined exactly as for other simple cases of twinning. Refinement of racemic twinning should normally only be attempted towards the end of the refinement after all non-hydrogen
atoms have been located. If racemic twinning is refined in this way, the utomatic calculation of the Flack x parameter in the final structure factor cycle is suppressed, since the BASF parameter is x.
8Â¥2011-04-28 22:18:18
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Originally posted by cluster8676 at 2011-04-28 22:19:36:
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