st">"wt"</span>, <span class="st">"drat"</span>, <span class="dt">what =</span> <span class="st">"effect"</span>, <span class="dt">draw =</span> <span class="ot">FALSE</span>)
<span class="kw">ggplot</span>(cdat, <span class="kw">aes</span>(<span class="dt">x =</span> 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 cl