a></span><span class="op">(</span><span class="st">"white"</span>, <span class="st">"black"</span><span class="op">)</span>, axes <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  xlab <span class="op">=</span> <span class="st">""</span>, ylab <span class="op">=</span> <span class="st">""</span></span>
<span><span class="op">)</span></span></code></pre></div>
<p><img src="https://i.imgur.com/IHa0bMm.png" width="20%"></p>
</div>
</div>
<div class="section level2">
<h2 id="related-projec