Fig. 1
Ca II Mount Wilson S-index of ɛ Eri. Data set covers a period from 2002 to late 2018 and it comes from four different instruments: the SMARTS 1.5 m telescope (cross-symbols), SSS at Lowell Observatory (squared-symbols), HIRES at the Keck Observatory (triangle-symbols), and the TIGRE telescope at La Luz Observatory (plus-symbols). The solid line is the sinusoidal function representing the peak with the highest power in the periodogram (see Sect. 2.1.4).
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