Properties of the stellar surface regions occulted by HD 3167 b (same details as in Fig. 5). The local stellar line cannot be detected in individual exposures, as can be seen from the broad HDI of the line model parameters. Nonetheless, the RV HDIs are not entirely set by the uniform prior, showing that individual exposures contain information on the local stellar line that can be exploited via a global fit to the transit time series. We thus emphasize that the solid black lines models were not fitted to the properties loosely constrained by each individual exposure, but were derived from the global fit to the CCF_intr time series.