al-link">lowess</a></span><span class="op">(</span><span class="va">yearID</span>, <span class="va">max</span><span class="op">)</span>, col<span class="op">=</span><span class="st">"blue"</span>, lwd<span class="op">=</span><span class="fl">2</span><span class="op">)</span></span></span>
<span class="r-in"><span>  <span class="fu"><a href="https://rdrr.io/r/graphics/abline.html" class="external-link">abline</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/stats/lm.html" class=