Time series of the SOPHIE and SPIRou RVs. Top: the best-fitting GP models using a quasi-periodic kernel in the SOPHIE and SPIRou data are shown in blue and red, respectively. The light-blue and light-red colors depict the 3σ level of the uncertainties. The residuals of this model have a scatter of 2.6 m s⁻¹ for SOPHIE, and 2.4m s⁻¹ for SPIRou and are shown below the time series. Middle and bottom: zoom onto the SOPHIE and SPIRou RVs divided into the seasons defined in Table 6 with their best-fitting GP models.