n><span class="fu">::</span><span class="fu"><a href="https://stringr.tidyverse.org/reference/case.html">str_to_title</a></span><span class="op">(</span><span class="va">.x</span><span class="op">)</span>,
                               ylab <span class="op">=</span> <span class="cn">NULL</span>,
                               perc.k <span class="op">=</span> <span class="fl">1</span>,
                               palette <span class="op">=</span> <span class="st">"Set2"</span>
                           