Comment 4 for bug 800050

I don't think changing the fill color like in the graphs you linked to is a good way of plotting this - IMO it's not very well-readable, especially in a small plot. Your second option would be prefereable, although plots potentially changing order all the time would lead to a pin-striped network graph, also not very beautiful.

Is it possible to draw the filling with partial transparency? That way, you could draw line graphs with half-transparent filling, which would nicely add together for a denser color in the overlapping area. Like so: