[ccp4bb]: free R in refmac 5

[Wolfram Tempel <tempel@sgx3.bmb.uga.edu>]

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Colleagues, I would like to invite your learned opinion on the following:
During the refinement of a 1.2A crystal structure I somehow (long story) 
"lost/contaminated" my free reflection set. I attempted to help myself 
by randomizing coordinates (average displacement 0.2A) and assigning a 
fresh R free set. After that, the R factor starts off in the high 20%s 
but in the process of refinement, the R and Rfree do not diverge while 
dropping to approx. 16%. Have I rendered my cross validation meaningless?

Kind regards.
Wolfram Tempel
U. of Georgia