Mass distribution of the Krüger (thick solid blue line), Strub (dashed red line), union (dotted indigo line), and intersect (dash-dotted maroon line) subsets for the masses derived from measurements (panel a; cf. Sect. 4.1), approximated with β ≡ 1 (panel b; cf. Sect. 4.2), and calculated iteratively (panel c; cf. Sect. 4.3) with an assumed density of ρ_d = 2500 kg/m³. Measurement-derived masses corresponding to v_msr < 3 km/s were not taken into account (cf. Sect. 4.1). (See Krüger et al. 2015, Fig. 5, and Janisch 2021, Fig. 5.32.)