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Plot cuts off lines
See the following code
http://play.golang.org/p/gNd64W9hDY
The maximum of the plot cuts off the peak of the line.
I think that the top of the plot needs to be padded by the line width. It's ugly, but without changing the API, the only way that I can see to do this is to add GlyphBoxes for the extreme points in the line plotter. The size of the box should be linewidth/2.