 <span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span>a <span class="op">=</span> <span class="fl">2</span>, b <span class="op">=</span> <span class="fl">1</span><span class="op">)</span>,</span>
<span>  title <span class="op">=</span> <span class="st">"Irrigation 5"</span></span>
<span><span class="op">)</span></span>
<span></span>
<span><span class="co"># Return Sigmoidal model summary</span></span>
<span><span class="fu"><a href="https: