==== Reference commits ====
* The DPL94 model [http://article.gmane.org/gmane.science.nmr.relax.scm/1761617757]* The M61 skew model [http://article.gmane.org/gmane.science.nmr.relax.scm/1766017730]* The M61 model [http://article.gmane.org/gmane.science.nmr.relax.scm/1766117616]* [http://article.gmane.org/gmane.science.nmr.relax.scm/17730 The M61 skew model17660]* [http://article.gmane.org/gmane.science.nmr.relax.scm/17757 The DPL94 model17661]
=== Adding support for the parameters ===