title: gnuplot ploting each series with different symbol
body: <p>I have a file with different series like:</p>
  <pre><code>x0_1 y0_1 A_0
  x0_2 y0_2 B_0
  ...
  x0_n y0_n N_0
  
  
  x1_1 y1_1 A_1
  x1_2 y1_2 B_1
  ...
  x1_n y1_n N_1
  </code></pre>
  <p>If I do <code>plot &quot;data.txt&quot; u 1:2:3 w lp lc palette</code> I can plot all the series with different lines each. But how can I put a different symbol for each line?</p>