page71 found this picture first.

seen on

• http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0001TV&topic_id=1&topic=a
• http://ffffound.com/image/f61a9eef4d3f3b664e140fadad4f309c2a6da01b
• http://vi.sualize.us/view/1359aefce946ac7fa044a849ca2224b7/
• http://www.edwardtufte.com/bboard/images/0001TV-1431.gif

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