RV (top panel) and FWHM (bottom panel) time series. The purple markers in each panel represent the HARPS RV and FWHM measurements with inferred offsets extracted. The inferred multi-GP model is shown as a solid black curve, where the dark and light shaded areas show the 1 - and 2σ credible intervals from this model, and can also explain the data, but with a correspondingly lower probability. The solid red line in the top panel shows the star-only model, and the teal sine curve shows the Keplerian for TOI-733 b. In both panels, the nominal error bars are plotted in solid purple, and the jitter error bars (σ_HAPRS) are semi-transparent purple.