  color <span class="op">=</span> <span class="st">"white"</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="gf_density_2d-2.png" alt="" width="700" height="433"></span>
<span class="r-in"><span><span class="fu"><a href="gf_jitter.html">gf_jitter</a></span><span class="op">(</span><span class="va">avg_drinks</span> <span class="op">~</span> <span class="va">age</span>,</span></span>
<span class="r-in"><span>  alpha <span class="op">=</spa