Fig. 12
Cycle period, Pcyc, as function of the rotational period, Prot. Dotted line: active (A) branch; solid line: inactive (I) branch; black dots and crosses: original data of Böhm-Vitense (2007), updated with the new measurements available in Brandenburg et al. (2017); the black dots are secondary periods of some stars on the A branch; colored symbols: cycles detected in X-rays (Robrade et al. 2012; Orlando et al. 2017; Sanz-Forcada et al. 2013).
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