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Fig. 4
Upper panels: periodograms of the 
(with S/N> 20) and of the Hα indices for HARPS-N data. The red solid line indicates the 40.2 d period, the red dotted lines represent its 1st, 2nd and the 3rd harmonics; the blue dotted line indicates the period of planet b. Lower panels: correlation with the RV residuals.
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