I forgot to mention that relax can be used to easily convert between
the different rotational diffusion parameter sets. For instance if
you have a relax model-free results file for spheroidal diffusion
(axial symmetry) and you would like to convert the parameters {tm, Da}
into {tm, Dratio} or {Dper, Dpar}, type something like:
relax> run.create('prolate', 'mf')
relax> results.read('prolate', file='results.bz2', dir=None)
Opening the file 'results.bz2' for reading.
relax> diffusion_tensor.display('prolate')
This will print out all the different parameter values.
Edward
Re: Brownian rotational diffusion mini-tutorial.