Fig. 4.

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Observed normalized Stokes parameters q and u of Swift J1727.8−1613 (gray crosses), along with their state-wise averages (colored, open symbols; as marked in the figure) in B (panel a), V (panel b), and R (panel c) bands. The errors on observed data of the source are 1σ. The IS polarization estimate is given by the black circle (3σ error) at the intersection of the dotted lines.
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