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Dear Sir:

Dynamic range is not shown on the FastRawViewer histogram, only the range of raw values is shown.

Dynamic range is the ratio of the maximum reading (which is signal+noise) to the minimum reading (which is noise). Since different cameras and camera samples have different noise characteristics, since noise depends on the temperature, since the maximum signal is also not a constant (while with different standards the maximum signal is defined differently), etc. FastRawViewer doesn't show DR.