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4.2 on the top, 4.3 on the bottom.
It appears that the line graph is doing some sort of automatic smoothing between points, to the point where it looks less like a single line and more like a radio interference graph. When the line width is 1 and the graph is smaller, you can see that it produces a "chunky" graph when compared with 4.2:
4.2 on the right, 4.3 on the left.
This is all with antialiasing turned off, though turning it on will yield similar results.