Canon 6D Mark II - maximum readout at different ISO settings


I just did a series of overexposed images from ISO 100 to ISO 12800.

The goal was to find out the maximum value stored in the RAW of my Canon 6D Mark II with RawDigger software.

I was surprised to see, that @ ISO 100, 125, 200 and 250 the maximum value for R, G, B and G2 is 15.871, but for ISO 160 it is an average of 13.118.

The next group of ISO is 400, 500, 800, 1.600, 2.000, 3.200 and 4.000 with a maximum of 14.335 wheras ISO 1.250 has a minimum of avg. 11.897,5.

How can that be?

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