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Re:Whatever It Takes: Visualizations in E-mail with d3.js by cpeterso on Friday November 02, 2012 @06:33PM (#4735106)
A composite bar chart is like a pie chart that has been unrolled. The length of the bar is the "whole".

http://www.ncsu.edu/labwrite/res/gh/gh-bargraph.html#composi...

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