The help doc is misleading for coherence estimation

The default degree of flat earth polynomial for interferometry formation in the SNAP gui is is 5. Does not it substract the reference phase from the estimated coherence. The doc is misleading as it says that:

The reference phase is subtracted if there is a 2d-polynomial computed – result of “Compute Interferogram” operator.

The doc also says that:

Note that this is a “general” coherence estimation.

Is not it “Standard” method? The method used in no more explained in the doc, any references used would be appreciated.

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