title: short dashed line length in gnuplot
body: <p>I have a horizontal line in a diagram with the following terminal set in gnuplot:</p>
  
  <pre><code>    set terminal postscript eps size 8.5cm, 7cm enhanced color font 'Helvetica,10'
      set style line 5 lt 2 lc rgb "black" lw 3
      f(x)=5.0
      plot f(x) w l ls 5
  </code></pre>
  
  <p>The line width is ok, but the length of the dashes are too short. How can I increase it without changing the terminal mode to dashed line?</p>