Fig. 8
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Example of the R′HK time series (black dots in the upper panel) and the corresponding GLS power spectrum (red line in the lower panel), for HD 7924, HD 219134, and HD 156668. Prominent periodicities in the R′HK data appear as peaks in the GLS plot. The 1% and 0.1% false-alarm probability levels are indicated in blue and orange, respectively.
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