Fig. 5.
Top panel: Lomb-Scargle periodogram for normalized Stokes parameter u in the B band. Bottom panel: Lomb-Scargle periodogram zoom for the normalized Stokes parameter u in the B, V, and R bands (solid blue, dashed green, and dotted red curves, respectively). The horizontal dashed line corresponds to false alarm probability (FAP) = 1%. The vertical red line corresponds to one half of the orbital period Porb = 26.496 d.
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