Fig. 7
Product of the Scargle periodograms of the CoRoT and Hipparcos light curves and of the EW (right inset) of the Mg ii 4481 Å line, after normalizing those three individual periodograms through division by the maximal amplitude (unitless, value between 0 and 1). The Scargle periodogram of the radial velocity of the Mg ii 4481 Å line is shown in the left inset for comparison.
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