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Fig. 8.


Activity cycle phase difference Δϕ against the photometric sine amplitude. Colors and symbols have the same meaning as in Fig. 6. The photometric amplitude of the solar cycle (yellow star) was adopted from Shapiro et al. (2016). These authors calculated a total amplitude of 0.37 mmag, which results in a sine amplitude of ampphot,  Sun = 0.185 mmag.

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