pan class="op">)</span><span class="op">)</span><span class="op">)</span>
<span class="op">)</span>

<span class="va">server</span> <span class="op">&lt;-</span> <span class="kw">function</span><span class="op">(</span><span class="va">input</span>, <span class="va">output</span>, <span class="va">session</span><span class="op">)</span> <span class="op">{</span>
  
  <span class="co"># Draw plot and extract coordinates</span>
  <span class="va">output</span><span class="op">$</span><span class="va">alluvial