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VBA code to find the area between two curves plotted in excel

Last Modified: 2016-02-11
I have two curves as shown in the attached file. The first one is a two-point straight line. The second is a series of straight lines. The missing values in the second one to be interpolated.

I need the total area between the two lines, the areas above and below to be returned separately. The area is also bounded by vertical lines through the end points of the first line.
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