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Phil, On 29 May 2012 14:08, Phil Evans <[log in to unmask]> wrote: > NO do NOT invert the hand. If you do you will end up with left-handed helices etc Surely not if you take care to also change the signs of the anomalous differences? > The alternative indexing systems all need to preserve the right-handed axis system imposed by the data integration program (eg k,h,-l) > > The ONLY time it is valid to invert the hand is if the indexing/integration program itself inverted the hand due to a bug (this has been know, but not for a long time) Assuming I've got the correct transformations and a.u. in P321 it's only possible to re-index from the alternate setting if the hand is inverted (and the anomalous data & any phase columns converted). Cheers -- Ian