Fig. A.2
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Generalized Lomb-Scargle periodograms (GLS) of the ESPRESSO activity indicators of K2-157. The grey circles indicate the maximum power frequencies. The vertical dash-dotted lines indicate the frequencies of the sinusoidal periodicities of Candidate#l and Candidate#2. The horizontal dotted lines show the 10%, 1%, and 0.1% FAP levels.
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