Comparison between photometric and RV stellar activity. Top panel: TESS light curve of HD 63433 contemporaneously with the RV of CARMENES data. The blue dots are the PDCSAP flux, and the black line indicates the best activity model. Bottom panel: CARMENES RV VIS data shown with blue dots. The black line shows the GP activity model with its 1σ confidence level (grey shadow). The solid red line depicts the RV model predicted from the TESS light curve using FF′ method.