... properties

It will be interesting to relax this assumption in future work. Also, it should be emphasized that we do not ignore general relativity effects acting on reprocessed photons of the spot (see Sect. 2.6).

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... emission)

In fact, KY transfers all four Stokes parameters, which are necessary to compute the light signal from a polarized source, which would be received in a detector equipped with a polarizer. However, polarimetric information is superfluous for the present paper, and so we ignore it here.

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