Fig. 10

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Periodogram of all pEW(Hα) (blue line) and only activity level (1) and (2) (red line). A periodogram for the shuffled data is shown in green. The dashed blue line corresponds to a FAP level of 10% for the power shown in blue, while the dashed red line corresponds to a FAP level of 0.5% for the power shown in red. The dashed vertical lines mark the peaks corresponding to periods of 2670, 1200, 161, 112, 100, 96.4, 81.8, 78.8, and 68.4 days (from left to right).
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