Icon: assets/graph-icon.png
Artist: Dirceu Veiga
URL: http://www.fasticon.com/freeware/comic-ipad-icons/
LICENSE:
  All Icons on the FastIcon “Download” page are Freeware for Personal Use.

  However, if you want to use these icons in your project, software,
  application or website, you need to pay US$ 24 per icon set.