BT.2020 is too wide for any display so I assume the BT.2020 YCbCr values are converted to DCI-P3 RGB values.
Measuring the gamut with an i1d3: Wide on the C7 is DCI-P3 (a little smaller than it should be but close), Extended is BT.709 (a little wider than it should be but close), and Auto switches between the two depending on the content.
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