INDI 1.8.9, ASI SDK 1.16.3. The images look good overall. FITS data are 16-bit, but all DNs are multiples of 4, so really it is just 14-bit. ZWO specs say camera's ADC is 16-bit.
Does anybody see 16-bit data? I guess older ASI2600MC may behave similarly. I could not find any knobs that seem related.

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