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<section begin=description/>
This is a major bug fix release. A number of important bugs have been fixed including the failure of model selection between global diffusion models when using the local tm τ<sub>m</sub> models ([https://gna.org/bugs/?7616 bug #7616]), the failure of model elimination when the model [[m0]] is used ([https://gna.org/bugs/?7226 bug #7226]), and the failure in the reading of old model-free results files from relax versions prior to [[relax 1.2.5|1.2.5]] ([https://gna.org/bugs/?7587 bug #7587]). Additional bug fixes are detailed below. New features include preliminary support for RNA/DNA data and support for the [http://www.nmr-relax.com/manual/grace_write.html grace.write user function] for reduced spectral density mapping.
<section end=description/>
<section begin=bugfixes/>
* Model selection between the global diffusion models no longer fails if all residues of the local tm τ<sub>m</sub> models have been deselected by model elimination. ([https://gna.org/bugs/?7192 bug #7192])
* The 'angles.py' sample script no longer fails when residue specific relaxation data is missing (corrupt input data). ([https://gna.org/bugs/?7224 bug #7224])
* Prior to executing Modelfree4, Dasha, Molmol, Grace, or OpenDX, tests are run to determine if the binary exists, is executable, and is in the system path. ([https://gna.org/bugs/?7225 bug #7225])
* Model elimination when using the model-free model [[m0]] no longer fails. ([https://gna.org/bugs/?7226 bug #7226])
* The strict checking of the Da D<sub>a</sub> and Dr D<sub>r</sub> diffusion tensor parameters has been relaxed to allow for optimisation imprecision. ([https://gna.org/bugs/?7297 bug #7297])
* The reading of Modelfree4 mfout results files no longer fails when residue specific relaxation data is missing (corrupt input data). ([https://gna.org/bugs/?7277 bug #7277])
* If optimisation returns an infinite value or a NaN value, these are now caught and a RelaxError thrown. ([https://gna.org/bugs/?6503 bug #6503], [https://gna.org/task/?3621 task #3621])
* Files containing relaxation data not consisting of exactly 4 columns will now be read. ([https://gna.org/bugs/?7583 bug #7583])
* Model-free results files from relax versions prior to 1.2.5 are now properly read. ([https://gna.org/bugs/?7587 bug #7587])
* Model selection between the global diffusion models does not fail when the local tm τ<sub>m</sub> models are included. ([https://gna.org/bugs/?7616 bug #7616])
<section end=bugfixes/>