title: change font size on gnuplot
body: <p>I know there have been several posts on how to change the font size on gnuplot. However, in my code, even though I take the solution in previous posts, the output figures have no change. My code is :</p>
  
  <pre><code>set terminal png size 1280, 480;
  set xrange [0:100]
  set yrange [0:1]
  set xlabel 'n'
  set ylabel 'x_n'
  set tics font ",1"
  set output './time_series/r'.i.'.'.j.''.k.''.l.'.png';
  set title 'r = '.i.'.'.j.''.k.''.l;
  
  do for [i=0:3]{
      do for [j=0:9]{
      do for [k=0:9]{
      do for [l=0:9]{
      plot './time_series/r'.i.'.'.j.''.k.''.l.'.txt' every ::0::100 with linespoints ls 1 ps 1 pt 7 notitle
      }
      }
      }
  }
  </code></pre>
  
  <p>The command has no effect with any number I put into, i.e. </p>
  
  <pre><code>set tics font ",a number"
  </code></pre>
  
  <p>Any number produces the same font. Is there anything I missed?</p>
  
  <p>Thank you everyone.</p>
  
  <p>Update :
  Thanks Raphael. Here are two png produced. The first is with [set tics font ",1"]. The second, [set tics font ",10"].
  <a href="https://i.stack.imgur.com/W80jk.png" rel="noreferrer"><img src="https://i.stack.imgur.com/W80jk.png" alt="enter image description here"></a>
  <a href="https://i.stack.imgur.com/fom3x.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fom3x.png" alt="enter image description here"></a></p>