i>
<li><p>A matrix; in which case the first dimension should be draws and the second
dimension values of the curve.</p></li>
</ul></dd>


<dt id="arg--">...<a class="anchor" aria-label="anchor" href="#arg--"></a></dt>
<dd><p>&lt;bare <a href="https://rdrr.io/r/base/is.language.html" class="external-link">language</a>&gt; Bare column names or expressions that, when evaluated in the context of
<code>.data</code>, represent draws to summarize. If this is empty, then by default all
columns that are not group co