RM effect of the planet HIP 41378 f. Each instrument is represented by a colour: PARAS (grey), CARMENES (light green), HARPS-N (purple), HERMES (pink), ESPRESSO (light blue), NEID (red), HIRES (dark blue,) EXPRES (dark green), and MaHPS (brown). All instruments observed the same event. The median of the best fit is represented by an orange line, and the shadow area represents 1σ the uncertainties. The dotted black line corresponds to the RM effect of planet f if Ψ = 0.