Absolute magnitude corresponding to the median distance of the previous plot. Top panel: absolute magnitude of the selected stars without zero-point systematic correction of parallaxes. Extinction (from Schlegel et al. 1998) was taken into account, although it is very low (< 0.1 mag in K), so the result will not be affected by the extinction calculation. The peak of bright RCGs is between the two red dashed vertical lines. The peak of faint RCGs is between the two green dashed vertical lines. Bottom panel: same absolute magnitude calculation for one line of sight with a zero-point systematic correction of parallax according to Eq. (4) for Δπ(G = 15) = 0.015, 0.025 and 0.050 mas, respectively.