Fig. 4

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Upper panel: generalised Lomb-Scargle periodogram of the combined S1 and S27 TESS light curves. The red dashed line marks the rotation period of the star. The equally spaced peaks symmetrically distributed around the dominant frequency are due to the ~2-yr gap between the two TESS observations. Lower panel: autocorrelation function of the combined TESS light curve. The red dashed line marks the rotation period of the star.
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