Fig. 5

Top: Gaussian process regression over-plotted on the high-frequency time-series. The rms of those data is 0.019 dex. Middle: as in the top panel, however each subplot is a zoom on times where stellar activity is well sampled by the data. Bottom: residuals of the high-frequency
time-series after removing the GP regression. The rms of those residuals is 0.011 dex.
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