Fig. 5.
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Three examples of frequency spectra. HD 56876 displays red noise, long-term variations (peak labelled ‘T’ at f < 0.5 d−1), isolated signals at low and high frequencies (labelled ‘dom. peak’, LFi, HFi), and a small FG (labelled ‘G’). HD 67536 displays FGs (labelled Gi) while HD 193794 only displays red noise. The dashed curves correspond to the significance level, set to five times the noise level. Figures showing the full set of frequency spectra are available on Zenodo (https://zenodo.org/doi/10.5281/zenodo.12699682).
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