/a>  <span class="co"># Using the x and y limits, convert the grid coordinates into plot</span></span>
<span id="cb7-20"><a href="#cb7-20" aria-hidden="true" tabindex="-1"></a>  <span class="co"># coordinates. Use global assignment.</span></span>
<span id="cb7-21"><a href="#cb7-21" aria-hidden="true" tabindex="-1"></a>  polygon_coords <span class="ot">&lt;&lt;-</span> <span class="fu">lapply</span>(xspline_points, <span class="cf">function</span>(pts) {</span>
<span id="cb7-22"><a href="#cb7-22" aria-hidden