Fig. 3.
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Fourier spectra of Kepler and TESS data, with Kepler shown in the upper panel and TESS data in panels 2–5. Original unfiltered data are depicted in blue, while bandpass-filtered data are shown in orange. The grey area highlights the position of the hump, and dotted black vertical lines mark the spike frequency and its harmonics. No additional signal is found beyond 2.5 cd−1.
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