Fig. 14

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TESS light curve of RU Lup from Sector 65 (2023). The light curve is plotted as a function of the time t from the beginning of the observation (MJDbeg = 60068.25). The top axis show the phase ϕ computed with P = 3.63 days (i.e., the spot period, Sec. 4.1). The reference date for ϕ = 0 is MJD0 ≡ 59264.336. The blue lines mark the phase ϕS (from Sec. 4.1), where the maximum contribution from the hot spot is expected. The red lines mark the epochs of the CHIRON spectroscopic observations.
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