Fig. 6.
Lomb-Scargle periodograms derived from the Kepler data for the systems KIC 4480321 (top left), 5219533 (top right), 8975515 (bottom left), and KIC 9775454 (bottom right). The frequencies plotted in orange illustrate the full spectrum across the range [0–24.5] d−1, and the frequencies over-plotted in black have a signal-to-noise ratio higher than 4.
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