title: GNUPLOT: dot plot with data depending dot size
body: <p>I am trying plot data sets consisting of 3 coordinates:
  X-coordinate, x-coordinate and the number of occurrences.
  example:</p>
  
  <pre><code>1 2 10 
  3 1 2
  3 2 1
  </code></pre>
  
  <p>I would like to draw for every line a dot at x,y with a diameter which is depending on the third value.</p>
  
  <p>Is that possible with Gnuplot?</p>