title: Line plot in GnuPlot where line width is a third column in my data file?
body: <p>I have a datafile that has three columns :</p>
  
  <pre><code>1 1.0 1
  2 1.5 2
  3 0.0 3
  4 1.2 2.5
  5 1.0 1
  6 1.1 5
  </code></pre>
  
  <p>where the first column is my X value, the second column is my Y value, and the third column is the line width.  I'd like for each line segment to be plotted according to the third column line width. </p>
  
  <p>I tried:</p>
  
  <pre><code>plot 'file1.dat' using 1:2:3  with lines lw var
  </code></pre>
  
  <p>But I get undefined variable: var error.</p>
  
  <p>Is this possible in gnuplot?</p>
  
  <p>Thanks.</p>