A nice interactive feature would be: for the line graph that a slope graph is a "zoom" of (according to charlie's explanation), be able to slide or drag over th

A nice interactive feature would be: for the line graph that a slope graph is a "zoom" of (according to charlie's explanation), be able to slide or drag over the line graph and have the slope graph for the current focused period appear, either over or next to the line graph depending on available space.