ting the rate of change over time.</p>
<div class="sourceCode" id="cb15"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="va">a</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/graphics/plot.default.html" class="external-link">plot</a></span><span class="op">(</span><span class="va">mod_1</span>, type <span class="op">=</span> <span class="fl">4</span>, color <span class="op">=</span> <span class="st">"black"</span>, title <span class="op">=</s