s="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/expression.html" class="external-link">expression</a></span><span class="op">(</span><span class="va">degree</span> <span class="op">*</span> <span class="st">"F"</span><span class="op">)</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>    xaxs <span class="op">=</span> <span class="st">"i"</span>, type <span class="op">=</span> <span class="st">"l"</span></span></span>
<span class="r-in"><span><span class="op">)</span>