Fig. 4
Sample periodograms from the Hα peak of the HARPS data, for the range between 40 days and 130 days in steps of 0.01 days. Top panel: periodogram derived from the equivalent widths (EW) and the bottom panels ones derived from the peak ratios (PR). None have any clipping or binning of the data. The strongest five peaks are marked on the vertical black lines.
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