Left panel: distribution of absolute G magnitudes for the full Gaia EDR3 8 mas sample. The blue distribution is for selected sources and the red one for rejected sources using a bin size of mag. The slight bump in the distribution of selected sources at M_G = 15 mag that coincides with the maximum of the rejected sources is probably indicative of contamination. Right panel: CAMD diagram for the full sample. The blue points are good solutions and the red poor ones. The strip of source with nominally good solutions connecting the main and white dwarf sequence at M_G ~ 15 is unexpected and due to contamination of the GCNS by faint objects at distances of 80–120 pc, as discussed in Sect. 4.5.