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Fig. 3
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GJ 1. Top: S-index time series. Middle: GLS periodogram (blue): (4286 ± 479) days with FAP = 0.01% and FAPbootstrap = 0.04%. BGLS periodogram (red): there is a probability of 99% that the peak of ~4200 days corresponds to a magnetic activity cycle for this star. Bottom: phase-folded time series with an ~4200 day period.
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