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Wow you're right, but look at

Wow you're right, but look at the histogram for the whole picture, it's very strange, around 2048 you have values that never occur which gives these huge peaks and troughs but the rest of the histogram is much more normal or at least has a much tamer version of the problem. I knew that ADCs could have such quirks but it still looks pretty odd.

To be honest it kind of makes you want to reconsider relying on values in the vicinity of 2048 to determine anything.