I have to create a chart representing population data: males & females. in
addition to these two columns, I would like to add the sum of the two.
Graphically it would be great to represent the third column (the total
population) behind the two M & F columns, providing visually an indication
that it is the sum of the two.

I've seen something like this in a recent PPT created with Office 2007
(charts from Excel 2007, the version I'm currently using). Is there a smart
way to obtain this result?

Thanks, Stefano