Histograms of the absolute G magnitude of sources with parallax uncertainties better than 10% in the colour bin 1.3 < G_BP − G_RP/mag < 1.4, from Group 4 (blue thick histogram) and Subgroup 4a (red thin histogram) in Dataset C, and from the constant+variable DR2 sample (filled grey histogram). Bins are 0.1 mag wide, and the numbers of sources per bin have been multiplied by two for Subgroup 3a and by 10⁻³ for the full DR2 sample. The vertical dashed line locates the absolute magnitude at maximum of the full DR2 distribution (6.525 mag). A vertical dotted line is added at an absolute magnitude 0.75 mag brighter than the dashed line. The abscissa range has been limited to highlight the distribution of main-sequence stars.