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Re: [ccp4bb]: Anomalous data?

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>  We recently collected MAD data sets at CHESS(F2) on a 
> protein crystal soaked in an Os solution.  The EXAFS scan before the 
> data collection showed the presence of Os atoms in
> the crystal.  Now when we use scalepack to find how good
> the anomalous differences are, the output says the differences
> are zero!  What does this mean?  Could random binding of Os
> give such a result?  Thanks for any ideas/tips.

Certainly:  the EXAFS scan does not distinguish where the Os atoms are -
they could be in the cryo-protectant, for all you know.  Did you