title: Gnuplot x tic labels overlap
body: <p>I am drawing a gnuplot chart from datafile with such format:</p>
  
  <pre><code>01 value_1_1 value_2_1
  02 value_1_1 value_2_1
  ...
  01 value_1_n value_2_n
  </code></pre>
  
  <p>using that command: </p>
  
  <pre><code>plot "action.dat" using 2:xtic(1) with boxes ls 1 title "First title",\
       "action.dat" using 3:xtic(1) with boxes ls 2 title "Second title";
  </code></pre>
  
  <p>X tic labels are loaded from the first column. When terminal is too small, labels start to overlap. How can I hide x tic label if it overlaps previous label? Or, at least, how can I draw only n-th label? </p>
  
  <p>I've tried to do something like that</p>
  
  <pre><code>set xtics 10 rotate by -90
  </code></pre>
  
  <p>but failed.</p>