Histogram of corrected (see Sect. 4.1 for parallax bias corrections) Gaia EDR3 parallaxes for the RG (red) and BG (blue) groups, showing two different statistical distributions. RG shows smaller parallaxes than BG. This result, together with those shown in Figs. 8–12, strongly suggests that both populations are well separated by colour, position, kinematics, and distance. Gaussian Kernel density estimators are also drawn.