pan> <span class="op">+</span></span></span>
<span class="r-in"><span>    <span class="fu"><a href="https://ggplot2.tidyverse.org/reference/geom_abline.html" class="external-link">geom_hline</a></span><span class="op">(</span>yintercept <span class="op">=</span> <span class="fl">75</span>, colour <span class="op">=</span> <span class="st">'red'</span><span class="op">)</span> <span class="op">+</span></span></span>
<span class="r-in"><span>    <span class="fu"><a href="https://ggplot2.tidyverse.org/referenc