"external-link">string</a>&gt; Density estimator to use for smoothing. One of:</p><ul><li><p>A function which takes a numeric vector and returns a list with elements
<code>x</code> (giving grid points for the density estimator) and <code>y</code> (the
corresponding densities). <span class="pkg">ggdist</span> provides a family of functions
following this format, including <code><a href="density_unbounded.html">density_unbounded()</a></code> and
<code><a href="density_bounded.html">density_bounded()</a></code