title: Gnuplot, how to add a grid without ticks?
body: <p>I have something like:</p>
  
  <pre><code>set grid xtics lt 0 lw 1 lc rgb "#a9a9a9"
  set grid ytics lt 0 lw 1 lc rgb "#a9a9a9"
  </code></pre>
  
  <p>or the same without the "xtics" tag, and that works fine!
  But if i add:</p>
  
  <pre><code>unset xtics
  </code></pre>
  
  <p>Then the grid disappears too :( </p>
  
  <p>How can I only have a grid, without tics?</p>