Relative RV measurements with ESPRESSO and best-fit models for TOI-815. Top: time series of ESPRESSO RV measurements (in blue). The complete inferred model, which comprises signals from two planets along with the activity-induced signal, is represented by a continuous solid line. Bottom: phase-folded RVs for TOI-815b (left) and TOI-815c (right). In all plots, the error bars in gray account for the estimated jitter (σ_w,ESPRESSO).