Fig. 1.
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Observed normalized Stokes parameters for Cyg X-1 in the B band. The vertical dotted black lines limit the observational seasons S1 and S3. The two vertical dashed red lines show the start and end of the IXPE campaign on 2022 May 15–21 (season 2). The vertical solid purple lines show the start and end of the TESS observations.
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