">)</span></span></span>
<span class="r-in"><span><span class="fu">plot_mfd</span><span class="op">(</span>mapping <span class="op">=</span> <span class="fu"><a href="https://ggplot2.tidyverse.org/reference/aes.html" class="external-link">aes</a></span><span class="op">(</span>colour <span class="op">=</span> <span class="va">first_two_obs</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>         data <span class="op">=</span> <span class="va">df</span>,</span></span>
<span class="r-i