span class="va">x</span>, <span class="va">fits</span><span class="op">)</span> <span class="op">+</span></span>
<span class="r-in"><span class="fu"><a href="https://ggplot2.tidyverse.org/reference/ggtheme.html" class="external-link">theme_bw</a></span><span class="op">(</span><span class="op">)</span></span>
<span class="r-plt img"><img src="plot_pp-1.png" alt="" width="700" height="433"></span>
</code></pre></div>
    </div>
  </div>
  <div class="col-md-3 hidden-xs hidden-sm" id="pkgdown-sidebar">
    <n