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Dear Niu,

could you let us know more about what you have already tried?

- - use more images, maybe all images for indexing
- - try a different program: xds instead of mosflm instead of hkl200
instead of d*trek instead of xds .... depending what you have tried.
- - try to find the unit cell dimensions manually from adxv
- - try cell_now with the SPOTS.XDS

in XDS I would check the output of IDXREF.LP to figure out if indexing
seems possible, i.e. if the input parameters seem stable or if they
are just floating around

and many more - it depends on the data set, really!

Best,
Tim

On 03/13/2013 09:12 PM, Niu Tou wrote:
> Dear colleagues,
> 
> We have some diffraction data from small peptide crystals, the
> shape of diffraction spots looks normal, and resolution is beyond
> 2A. The data were collected with 5 degree rotation per image. Later
> on we found it is hard to do index. Does anybody know some skills
> to figure this problem?
> 
> Best wishes, Niu
> 

- -- 
- --
Dr Tim Gruene
Institut fuer anorganische Chemie
Tammannstr. 4
D-37077 Goettingen

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