title: GNUPLOT: 2d histogram from set of points
body: <p>I have a pairs of the points with their weights:</p>
  
  <pre><code>#x  y  w
  0.111342 0.478917 0.232487 
  0.398107 1.79559 0.221714 
  0.200731 2.58651 0.0776068 
  0.0967412 1.49904 0.0645355 
  6.17638 8.63101 0.715604 
  0.306128 3.10917 0.0984595 
  0.340707 3.19344 0.10669 
  7.18627 8.59859 0.835751 
  8.56 9.63894 0.888065 
  5.14272 6.86074 0.749587 
  0.747202 3.812 0.196013 
  8.71891 10.1355 0.860232 
  0.346714 1.45895 0.237647 
  5.21932 8.84491 0.590094 
  9.42138 12.2082 0.771725 
  0.215627 2.42317 0.0889856 
  </code></pre>
  
  <p>How to plot nice 2d histogram image with color bar?
  I found nice <a href="http://pelican.rsvs.ulaval.ca/mediawiki/index.php/Making_density_maps_using_Gnuplot" rel="noreferrer">density map</a> description but I don't wont to go via python.
  I there way to use only gnuplot scripting?</p>