title: How to show a grid with two filled plots
body: <p>I am plotting to datasets with 'fillsteps' one below another and I want the plot two show only the area that is a difference between the two</p>
  <pre><code>plot [0:1][0:1] x with fillsteps above fill solid not,x**2 with fillsteps above fill solid lc rgb 'black' not
  </code></pre>
  <p>But the grid obviously gets blocked in this case:
  <a href="https://i.stack.imgur.com/fAy9q.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fAy9q.png" alt="enter image description here" /></a></p>
  <p>Is there any way to create something like a cross-section between the two areas, show the grid and get rid of those nasty artifacts that are seen below?</p>