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Fig. 2
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GLS periodograms of the activity tracers. From top to bottom: Hα, Hß, Hγ, Na D I, and S index. The dashed, solid, and dotted horizontal lines represent the 0.3%, 4.6%, and 31.7% FAP levels, corresponding to a 3σ, 2σ, and 1σ detection threshold, respectively.
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