les will not draw a legend, because the
legend will usually be confusing unless the labels are manually altered.
Legends can be switched on via the <code>guide = "legend"</code> option,
just like for all other scales.</p>
<div class="sourceCode" id="cb39"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span> <span class="fu"><a href="https://ggplot2.tidyverse.org/reference/ggplot.html" class="external-link">ggplot</a></span><span class="op">(</span><span class="va">diamonds</span>, <span clas