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Here is RAW data histogram of

Here is RAW data histogram of the RAW image you sent:
(black subtraction is turned off).

As you can see, the maximum value is 16500, slightly above 16383 (2^14-1)

If you scale data before recording by multiplying to 4 (to get 65535 range you mentioned above) this will result into 16-bit overflow.

If you do NOT scale data you'll never see ~65535 range because camera data range is (about) 0-2^14

-- Alex Tutubalin @LibRaw LLC