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WIDTHL=10 and WIDTHR=60 are setting the widths of the left and the right column/bar. BAR="12345678" etc. is used to create a 80 char long string of "="s. I didn't know any shorter way.
If you want to pipe results into it, wrap the whole thing in ( ... )
I know that printing bar graphs can be done rather easily by other means. Here, I was looking for a Bash only variant.
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