CARMENES RV data for HD 63433 (blue and orange dots for the visible and infrared, respectively). Top panel: combined model (black line) with its 1σ level of confidence (grey shadow), and the dashed red line depicts the Keplerian model for two planets. Middle panel: Keplerian model alone (dashed red line) and CARMENES VIS and NIR data after subtracting the best activity model. Bottom panel: residuals for the best-fit.