When zooming several times on a given point of an XYPlot, inaccuracies appear in the display.
The data supplied to JFreeChart is a set of points which ordinates are below or equal to 1.
Multiple zooms on the point where the curve is supposed to reach 1 show that it actually outreaches 1.
It seems like a very small delta is added each time the graph is zoomed in, resulting in a portion of the curve being slightly above 1, but still clearly visible on the graph.
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