Top panel: planetary signal of GJ 338 B CARMENES VIS RVs (blue dots) folded in phase with the orbital period derived from the GP regression analysis (the base model and the stellar activity were removed). The best Keplerian solution (black line) has an RV amplitude of 3.07 ± 0.37 m s⁻¹. The red dots correspond to the binned data. Bottom panel: RV residuals after the subtraction of the model. The weighted rms of the residuals is 3.2 m s⁻¹.