_plot</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://shiny.rstudio.com/reference/shiny/latest/renderPlot.html">renderPlot</a></span><span class="op">(</span><span class="op">{</span>
   
    <span class="co"># Width of node boxes</span>
    <span class="va">node_width</span> <span class="op">&lt;&lt;-</span> <span class="fl">1</span><span class="op">/</span><span class="fl">4</span>
    
    <span class="va">p</span> <span class="op">&lt;-</span> <span class="fu">ggplot</span><span c