title: Format of json data for D3 bundle layout
body: <p>I am trying to draw a bundle graph very similar to the one in this example, <a href="http://bl.ocks.org/1044242#index.html" rel="nofollow noreferrer">http://bl.ocks.org/1044242#index.html</a></p>
  
  <p><img src="https://i.stack.imgur.com/6dG3u.jpg" alt="enter image description here"></p>
  
  <p>I would really appreciate if anyone can help me out to figure out how "readme.json" file is supposed to look like.</p>