It appears to be a "rounding to pixels" problem - when making the metric graph, I had to determine how many pixels made up a gallon, then convert it to liters, and then split that into 4 equal parts. I assume you did a similar thing to do your coordinate plotting, but we are one pixel different per liter - IE, at 1LPM on my graph, you get 1.01 on the coordinate, and at 7LPM you get 7.07 on the coordinate. Perhaps there is some way to drop it by that .01 per liter on the coordinate side, as taking off one pixel from the graph would mean that the 4 equal parts would no longer be equal.
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If not, why not?
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