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Re: [ccp4bb]: refinement problem

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> My problem is in refining a higher resolution native data set, to 1.9 A.  The
> data is fairly isomorphous with the MAD data set, P21, a = 43.718 , b = 73.184
> , c = 47.427 , b = 113.842.  

Before looking at possible twinning problems ( I guess the experts will 
strike soon ) I would also suggest, given the resolution, to feed the 
starting model to ARP/wARP (www.arp-warp.org) and let the 'warpNtrace' 
protcole rebuild it. If that does not work and R/Rfree are still high I 
would start (well ... keep on ...) being worried ;-)