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Hello Ramon--

> 
> I am doing a RDC-refinement of an RNA molecule.
> 
> In Xplor I incorporated these values:
> sani coef 0.0 -51.72 0.14 
> (first number is addition (a0), second number anisotropy, and third
> rhombicity)
> 
> In my refinement script I have a floating alignment tensor.
> After refinement I do a backcalculation, and see a correlation between
> the experimental and backcalculated values of 0.997 !
> 

that does seem a bit too good to be true.

This is most likely caused by an unphysical configuration of the tensor
atoms. Please make sure that the pseudo-atoms representing the tensor
orientation make up an orthogonal set of axes. i.e.
  (X-O) dot (Y-O) = 0
and so on. 

By the way, this type of error is not possible if the Python interface
is used (correctly).

regards--
Charles
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