[ccp4bb]: Refmac vs. cns: nucleic acids?

[Phoebe Rice <price@midway.uchicago.edu>]

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I'd be interested in people's humble opinions on their experiences with 
nucleic acids in particular.  Many of the backbone torsion angles aren't 
well defined in moderate-resolution maps (2.5ish), but they do 
matter.  Especially for non-canonical structures, I've wondered if we're 
really dealing with them properly.