I want to put a line that connects two bars in Excel, and put different
values on top of it, like correlations or significances between the two bars.
Example: http://hawaii.edu/mri/excel.jpg

Right now, I am doing each by hand. I open it in PowerPoint, and then use
the shapes and text boxes to connect everything. Does Excel have a feature
to do this more-or-less automatically?

Thank you.