On 02/17/2011 09:35 PM, Peter Grey wrote:
> Dear CCP4 and XDS users,
>
> I have a P21 case with some strange ratios in the cell dimensions : a, b=a,
> c=1.5a, 90, 105, 90. The native patterson shows a strong peak (40% of
> origin) at (x,0.5,0) indicating some pseudo symmetry. Such cell dimension
> and peak prompted me to think that the actual space group is side-centered.
> However in XDS any choice of such space groups receives bad scores. Could
> XDS be wrong in such a case ?
>
> Thank you in advance for your time,
>
> Peter.
>
othercell doesnt think there is anything possible except P1.
Of course you wont be able to tell if it is P21 or P2; the translation
vector itself will generate absences along 0 k 0.
Eleanor
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