Fig. 6
Left upper panel: original time series of the CCF FWHM, showing the trend due to the defocusing. Left lower panel: residuals of the CCF FWHM after the subtraction of the fit. Right panel: periodogram of the residual CCF FWHM. The red solid line represents the Prot, the dotted lines represent its 1st, 2nd and the 3rd harmonics.
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