>)</span>,</span>
<span>        panel.border<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>color<span class="op">=</span><span class="st">"black"</span>,</span>
<span>                                    fill<span class="op">=</span><span class="cn">NA</span>,</span>
<span>                                    size<span class="op">=</span><span class="fl">1</span><span class="op">)</s