<span>  <span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># population ranges can expand by a given distance in all directions</span></span></span>
<span class="r-in"><span><span class="va">pop2</span> <span class="op">&lt;-</span> <span class="fu"><a href="expand_range.html">expand_range</a></span><span class="op">(</span><span class="va">pop2</span>, by <span class="op">=</span> <span class="fl">200</span>, start <span class="op">=</s