Fig. 4.
Autocorrelations of the power spectra, for the SONG spectrum in the upper panel, and K2 in the middle panel. Bottom panel: the two autocorrelations multiplied together. The vertical dashed lines in the upper panel indicate the signals originating from the 1 d−1 aliases in the spectral window, at 11.574 μHz and integer fractions thereof. The arrows indicate a value of 5.0 μHz, which we identify as Δν for ϵ Tau using various methods (see text).
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