Overview of the activity+planet modeling in the spectroscopic series obtained in case 2. Panels a, b, and c show the RV, log R′_HK, and BIS series, respectively (gray points). Red lines represent the models of the stellar activity obtained in the GP framework we used. The panels below report the difference between the observed points and the stellar activity models. Panel d shows the RV curve of the star after the subtraction of the stellar activity and phased with the period of TOI-1807 b; model of the RV series is reported in red; the region between the two gray shaded areas corresponds to one orbital phase.