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[ccp4bb]: Q: reduce size of Rfree set



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Dear all,

I refined a structure against data to 2.3 A, where the Rfree set
included 2600 reflections (5 % of data). I now have data to a much
higher resolution, and putting 5 % of data in the Rfree means  11000
reflections, which is quite a lot. I would like to use a smaller
fraction for the Rfree set (say 1 %). For this, I need only to keep 1
every 5 reflections of the "low resolution" free set.

Any hints on how I can do this ?

laurent
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Laurent Maveyraud               
Groupe de Cristallographie Biologique  -  IPBS-CNRS

205, route de Narbonne       	 Tel (+33) 05 61 17 54 35
31077 TOULOUSE CEDEX        	 Fax (+33) 05 61 17 54 48
France                       	 mailto:laurent.maveyraud@ipbs.fr
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