Detection of solar p-mode oscillations with Sun-as-a-star PEPSI spectra. Panel a: Frequency fits from the time series of 8.5 hours on Oct. 15, 2016. The peak at 3 mHz (5.5 min) appears with an amplitude of 47 cm s−1 (the blue line is the window function). Panel b: RV vs phase combined with the best-fit period. Its rms is 1.2 m s−1 .
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