Re: [ccp4bb]: indexing

["Hazes B." <bart@mrc-lmb.cam.ac.uk>]

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If the spot shapes are normal and there are no obvious signs of multiple
lattices present (non-merohedral twinning that is) then, in my experience,
failure to autoindex is due to incorrect detector distance, direct beam
center or some other camera parameter. If there are multiple lattices and
you can recognize them then you can hand-pick spots of one of the lattices
and autoindex on those.

Bart

On Wed, 19 Apr 2000, Quan Hao wrote:

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> 
> Hi,
> 
> We have collected some data on station F1 at CHESS. The crystals appeared to
> be hexagonal thin plates and diffracted to about 2.2A. We collected 75
> degrees of data for each of the three crystals. The spot shapes looked OK
> but we could not index the spots using DPS, DENZO or MOSFILM. The spots
> seemed to align along straight lines on all images and one could see the
> hexagonal features. Has anyone come across this before? Your help is greatly
> appreciated.
> 
> Quan Hao 
>