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(bar) charts, are bar charts having bars with non-uniform widths. Generally:
* Bars represent quantities with respective rectangles of areas A that are respective arithmetic products of related pairs of
** vertical-axis quantities (A/X) and
** horizontal-axis quantities (X).
* Arithmetically, the area of each bar (rectangle) is determined a product of sides' lengths:
::(A/X)*X = Area A for each barRoles of the vertical and horizontal axes may be reversed,

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