On 15 Jul 2010, at 17:06, Ethan Merritt wrote: > My gut feeling is that the best TLS description would be each base > (or base pair) in its own group, the use TLSMD to analyse and assign groups > for the backbone atoms. But again I have no actual experience with this, > so it's only a suggestion. Yes that's exactly what I was using before I found that paper! I think I'll stick with it. Huw -- Dr Huw Jenkins Astbury Centre for Structural Molecular Biology University of Leeds