title: gnuplot - color some tics or axis numbers in different color
body: <p>I'm using gnuplot to generate some plots with an x axis ranging from 0 to 20. Is it possible to set the color of some tics or axis numbers to a different color from the standard black?</p>
  
  <p>I only found a way to change the color of the all the numbers in the x axis red with <code>set xtics textcolor rgb "red"</code>. </p>
  
  <p>What I need is to be able to change the color of the tic or number at <code>x=0,3,6,...</code> to red and all the others should stay black. Is this possible with gnuplot?</p>