I based the coordinates on the gallons, since they were the original units, and set the scaling and offset to work with them. For the metric, the pixels are still translated to gallons, then multiplied by 3.7854118 to get liters.
It'd be a lot cooler to have the metric measurements match up to the american ones, rather than fudging the metric coordinates. Every other liter moved over by a pixel?
Edit-Hey pH, where can I get one of those one tenth pixel resolution monitors?
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