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Hello--

> I have a question regarding the refinement of protein structures using 
> experimental pseudo contact shifts. I have downloaded the sample 
> calculation from the website:
> 
> http://www.postgenomicnmr.net/SW/PARArestraints.html
> 
> However, convergence of the tensor parameters is not reached when I run 
> the unmodified sample script. It appears as if only the first iteration 
> of the tensor parameters is performed. After the first iteration, the 
> tensor parameters remain approximately constant. The result of the 
> first iteration varies with the initial values of the tensor 
> parameters. This shows that convergence has not been reached after one 
> iteration.
> 

To my knowledge that package is working correctly in
Xplor-NIH-2.9.7. However, it was not written here at NIH, so I can't
provide authoritative advice on this matter. I have CC'd the
appropriate contact, and hope we hear from them shortly.

best regards--
Charles

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