epicurves geom_histogram

[nsbatra]

In inject 11 I see that the first epicurve is made with geom_histogram() while the next two are made with geom_bar(). I would recommend sticking with geom_histogram() to emphasize that this should be used to show distribution of continuous data. It might also be worth varying the times of onset a bit.

[EKuki]

Thanks!
I have changed all to geom_histogram().