Maps of the CCF_intr during the transit of TOI-858 B b in Visit 1 (upper panel) and Visit 2 (lower panel). Transit contacts are shown as green horizontal dashed lines. Values are coloured as a function of their normalised flux and plotted as a function of RV in the stellar rest frame (in abscissa) and orbital phase (in ordinate). The stellar lines from the planet-occulted regions are clearly visible in both visits. The green solid lines show the best-fit model for the stellar surface RVs derived from a joint RMR fit to both data sets. The green vertical dashed lines show the spectroscopic, sky-projected stellar rotational velocity.