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Looks like something that can be put together in Illustrator or Freehand. Nothing to complex other than to create some primitive shapes, outline them and use a gradient fill.

What programs do you available to create vector art with?

D
 
The most effective way to find out what program was used to make those charts is to ask the person who wrote the article. His name is John Siracusa and his email is shown in the post. :p

Metadata shows that it was at least saved using ImageReady.
 
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