title: transparent color in javascript D3.js
body: <p>EDIT: I have a SVG graph produced with d3.js. The filled area of the graph is coloured by CSS rules. I would like the areas to be semi-transparent so that you can see data obscured by the foremost graph area.</p>
  
  <p>Original:</p>
  
  <p>Is there anyway to make the color of this graph transparent? <code></code><a href="http://jsfiddle.net/skys331/QBDGB/22/" rel="noreferrer">http://jsfiddle.net/skys331/QBDGB/22/</a>
  I want to be able to see behind the green data.</p>
  
  <p>Thanks</p>