title: R - draw new layer behind current plot
body: <p>Just curious, when plotting in R, <strong>one can easily change the order of the executive code to change the order</strong> of those "<em>layer</em>" on the plot, e.g.</p>
  
  <pre><code>plot(x, type = "n")
  lines(y)
  points(x)
  </code></pre>
  
  <p>to get <code>x</code> over the <code>y</code>. Are there any way to do it in an <code>adhoc</code> way, e.g.</p>
  
  <pre><code>plot(x)
  lines(y, behind = TRUE) # fictional option behind
  </code></pre>