href="https://ggplot2.tidyverse.org/reference/scale_viridis.html" class="external-link">scale_fill_viridis_d</a></span><span class="op">(</span>direction <span class="op">=</span> <span class="op">-</span><span class="fl">1</span>, guide <span class="op">=</span> <span class="st">"none"</span><span class="op">)</span></span></code></pre></div>
<p><img src="introduction_files/figure-html/unnamed-chunk-12-1.png" width="700"></p>
<p>And here is an example using
<code>geom_density_ridges_gradient</code>. Note t