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Fig. 18.


Paraboloid fit parameters aP (top), bP (middle), and θP (bottom) of Eq. (14) for the polarization degree of multiple FORS2 fields as a function of target altitude (left), median background polarization degree (middle) and intensity S/N (right). Different filters are color-coded, and filled circles represent our moonlit sky observations. Dashed horizontal lines are the median of the parameters per filter.

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