an> <span class="op">+</span> <span class="fu">scale_fill_brewer</span><span class="op">(</span><span class="op">)</span> <span class="op">+</span> </span>
<span class="r-in"><span class="fu">stat_summary</span><span class="op">(</span>fun <span class="op">=</span> <span class="va">mean</span>, geom <span class="op">=</span> <span class="st">"point"</span>, fill <span class="op">=</span> <span class="st">"black"</span>, shape <span class="op">=</span> <span class="fl">23</span>, size <span class="op">=</spa