title: Gnuplot error on command "set data s l"
body: <p>My program has gnuplot script and its first line is</p>
  
  <pre><code>set data s l
  </code></pre>
  
  <p>But this makes error </p>
  
  <pre><code>"cdia.GNUBAND", line 1: unrecognized option - see 'help set'.
  </code></pre>
  
  <p>I think it's the version problem and I have to change the "set data s l" command in right way. I searched on web but couldn't find it.. How do I solve this?</p>