her"</code>). Defaults to <code>NULL</code> which will result in the only method available being returned or an error asking the user to choose a method for equations for which more than one method is available (which is the case for very few species).</p></dd>


<dt id="arg-simplify">simplify<a class="anchor" aria-label="anchor" href="#arg-simplify"></a></dt>
<dd><p>A logical that indicates whether the ‘units’, ‘ref’, ‘measure’, ‘method’, ‘comments’, and ‘source’ fields should be in