class="op">=</span> <span class="st">"Color scheme"</span>,</span>
<span>     values <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"black"</span>, <span class="st">"yellow"</span><span class="op">)</span>, guide <span class="op">=</span> <span class="st">"legend"</span>,</span>
<span>     labels <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-lin