Dear relax-users,
I'm trying to fit some methyl-13C SQ CPMG data. I have a number of
residues, which appear to have an exchange contribution, but result in
poor fits e.g.
I've tried a variety of different relaxation dispersion models (CR72
full, B14 full, NS CPMG 2-site expanded, IT99, TSMFK01) but the fit
doesn't improve. I've also tried increasing the grid increment parameter
from 11 to 21, but again this doesn't improve the fit. Very occasionaly
when I have been testing conditions, a model has accurately fitted the
data (in the following NS CPMG 2-site expanded) but I am unable to
replicate this consistently.
Any suggestions to improve the reliability of this fitting would be very
much appreciated.
Many thanks,
Mark
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