pan> xvals)) <span class="op">+</span><span class="st"> </span>
<span class="st">  </span><span class="kw">geom_line</span>(<span class="kw">aes</span>(<span class="dt">y =</span> yvals)) <span class="op">+</span>
<span class="st">  </span><span class="kw">geom_line</span>(<span class="kw">aes</span>(<span class="dt">y =</span> upper), <span class="dt">linetype =</span> <span class="dv">2</span>) <span class="op">+</span>
<span class="st">  </span><span class="kw">geom_line</span>(<span class="kw">aes</span