Fig. 3

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LS periodograms of the TESS photometry from Sectors 9, 36, 63, and 90. The known 23.1 min and 25.01 h periodicities are marked with solid orange and blue lines, respectively, while the 11.4 h signal is marked with a solid green line. The dashed and dotted lines indicate harmonics of these signals using the same colour-coding.
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