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Fig. 3.


Upper panel: power spectrum from the full 57-day filtered and corrected time series. The inset (black) shows the spectral window (∼40% duty cycle) and (grey) a zoom-in showing the individual aliases. Lower panel: power spectrum of one single day (black). The red curve is a Gaussian fit to the power excess, the cyan curve is a 8Δν smoothed version of the power spectrum, and the blue is the 4Δν smoothed curve. For this day, the 4Δν smoothing results in a double hump, giving a poorly determined νmax. To better distinguish the three coloured curves in the lower panel, the 8Δν and the 4Δν smoothed versions were multiplied by a factor of 2 and 2.5, respectively.

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