Distribution of eRV^∗ and log g with respect to b along with the mid-plane and log g limit (3.75) overplotted as the black solid line in the upper and lower panels, respectively. The symbol colour-coding is the same as in Fig. 1, and dark orange crosses highlight targets with eRV^∗ > 5 km s^-1. This eRV^∗ limit is displayed as the black dashed line.