an>               col_var <span class="op">=</span> <span class="va">sex</span>,</span></span>
<span class="r-in"><span>               width <span class="op">=</span> <span class="va">width</span>,</span></span>
<span class="r-in"><span>               stat <span class="op">=</span> <span class="st">"identity"</span>,</span></span>
<span class="r-in"><span>               x_title <span class="op">=</span> <span class="st">"Body mass g"</span>,</span></span>
<span class="r-in"><span>               x_breaks_n <