/span><span class="va">firstnames</span><span class="op">)</span>,</span>
<span>      data <span class="op">=</span> <span class="va">ToothGrowth</span>, <span class="co"># new: I add the original data frame</span></span>
<span>      color <span class="op">=</span> <span class="st">"black"</span>, </span>
<span>      position <span class="op">=</span> <span class="fu"><a href="https://ggplot2.tidyverse.org/reference/position_dodge.html" class="external-link">position_dodge</a></span><span class="op">(</span