2D histogram of the estimated normalized masses as a function of the primary mass m₁ for the stars exhibiting a PMa signal-to-noise ratio Δ_G2 >  2. The normalized companion mass detection limits for the GDR2 for a star located at distances of 5, 15, and 50 pc are shown with dashed gray curves (see Sect. 3.7 for details). The area below the orange curve is the companion sensitivity domain excluded by the saturation limit of Gaia (G ≈ 3), considering the mass-luminosity relation of main sequence stars from Pecaut & Mamajek (2013).