op">)</span> <span class="op">|&gt;</span></span></span>
<span class="r-in"><span>    <span class="fu">gf_path</span><span class="op">(</span><span class="va">y</span> <span class="op">~</span> <span class="va">x</span>, color <span class="op">=</span> <span class="op">~</span><span class="va">t</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">}</span></span></span>
<span class="r-plt img"><img src="gf_line-4.png" alt="" width="700" height="433"></span>
</code></pre></