Fig. 3
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S index time series modelled with a GP using a quasi-periodic kernel. Both HARPS (red squares) and HARPS+ (yellow circles) data are shown, a) Model showing the GP resulting from the median of the hyper-parameters’ posteriors (blue curve). The coloured zone depicts the model 1-σ confidence. Error bars account for the white noise included in the fit. b) Residual of the fit.
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