Activity cycle phase difference Δϕ against the Rossby number Ro = Prot/τ. Colors, symbols, and horizontal dashed lines have the same meaning as in Fig. 6. The vertical dashed line indicates the transition around Ro = 1. The yellow star indicates the position of the Sun, RoSun = 2.16, adopting the values B − VSun = 0.653 (Ramírez et al. 2012), and the synodic rotation period Prot, Sun = 26.3 d.
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