Am 5 Dec 2008 um 13:50 hat Agnieszka Kiliszek geschrieben:

> Hi,
> 
> What is the meaning of R free of perfect twin? Shelxl counts it but it
> seems that the R f is no longer independent.
> 
> Aga


Dear Aga,

I also had this problem, however with Refmac5.5.

My solution was to use the CNS script "make_cv_twin.inp" to define the test set 
under perfect 
twin conditions and to reformat the data to the mtz format (using the 
corresponding ccp4i 
script).

Best wishes from

Karsten

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