Hi Troels, Awesome work with the fixing of the dispersion analysis for different data combinations! With all the new system and units tests that you added, relaxation dispersion in relax will now be much more robust. The more test coverage we have, the stronger the code will. I now think that relax will handle all data combinations that a user throws at it. Well, there is one exception where relax will fail catastrophically - that is if a mixture of fixed time experiments and exponential curves are used. But this and other cases can be handled when a user complains on the mailing list. Now that all the relevant bug reports are closed, I will look at releasing relax 3.1.6 with the fixes and the dispersion GUI tutorial. Was there anything else you were planing on committing to the repository before I tag the release? Cheers, Edward