span><span class="op">)</span><span class="op">)</span> <span class="op">+</span>
    <span class="fu"><a href="https://ggplot2.tidyverse.org/reference/geom_histogram.html" class="external-link">geom_histogram</a></span><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>y <span class="op">=</span> <span class="va">..density..</span><span class="op">)</span>, color <span class="op">=</span> <span cl