-link">element_line</a></span><span class="op">(</span>colour <span class="op">=</span> <span class="st">"black"</span><span class="op">)</span>,
    panel.background <span class="op">=</span> <span class="fu"><a href="https://ggplot2.tidyverse.org/reference/element.html" class="external-link">element_rect</a></span><span class="op">(</span>fill <span class="op">=</span> <span class="st">"white"</span><span class="op">)</span>
  <span class="op">)</span></code></pre></div>
<div class="figure">
<img src="dai