<section begin=features/>
* Numerous improvements for the relax_fit.select_model user function.
* Support for the saturation recovery experiment in the relaxation exponential curve-fitting analysis.
* Support for the inversion recovery experiment in the relaxation exponential curve-fitting analysis.
* Added a section to the start of the relaxation curve-fitting chapter of the manual to include descriptions of all supported models.
* Addition of a button to the R1 and R2 GUI analyses for selecting the desired exponential curve model via the relax_fit.select_model user function.
<section end=features/>