class="op">+</span> <span class="va">upp</span> <span class="op">~</span> <span class="va">year</span> <span class="op">|</span> <span class="va">group</span>, data <span class="op">=</span> <span class="va">plot_data</span>,</span></span>
<span class="r-in"><span>       type <span class="op">=</span> <span class="st">"l"</span>, lty <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">1</span>, <span c