On 21 Feb 2008, at 18:24, George M. Sheldrick wrote:
All SHELX programs and XPREP are also indifferent to the asu choice and to whether the data have been merged or not (even SHELX-76). It is CCP4 historical baggage and high time it was eliminated.
I'm sure that many if any of the CCP4 programs if any actually care about which asymmetric unit is used. It only matters when you are collecting together different datasets, eg native & derivative, and this handled automatically by CAD. Other people may have evidence otherwise
Phil
