l-link">aes</a></span><span class="op">(</span>x<span class="op">=</span><span class="va">x1</span>, y<span class="op">=</span><span class="va">x2</span>, group<span class="op">=</span><span class="va">leaf</span><span class="op">)</span><span class="op">)</span><span class="op">+</span> </span>
<span>  <span class="fu"><a href="https://ggplot2.tidyverse.org/reference/geom_density_2d.html" class="external-link">geom_density_2d</a></span><span class="op">(</span><span class="fu"><a href="https://ggplot2.tidy