As already said earlier, try Platon.
Alternatively you may use Superflip (Lukas Palatinus, EPFL: http://superspace.epfl.ch/superflip/) which contains a symmetry determination routine, described in the december 2008 issue of J. Appl. Cryst. Lukas or me may give you suggestions how to use it.

best wishes, Arie

[EMAIL PROTECTED] wrote the following on 05/11/2008 08:56:
Dear all,

Recently, I have refined the structure using powder data. In each asymmetric unit of Pmc21, there are two chemically similar but crystallographically different complexes. The center of these two complexes is rougly around 0,0,0.75. Therefore, the true space group may not be Pmc21. I am glad to know if there is a software to detect symmetry and suggest probable space group.

Thank you very much.

best regards
stephen





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A. van der Lee
Institut Européen des Membranes
CNRS - UMR 5635
Université de Montpellier II - Case Courrier 047
Place E. Bataillon
34095 MONTPELLIER Cedex 5 - FRANCE

Tel :  33 (0) 4 67 14 91 35
Fax : 33 (0) 4 67 14 91 19

Website X-ray scattering facility ICG/IEM:
http://www.iemm.univ-montp2.fr/xrayweb/main_uk.html
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