Mass vs. diameter distribution for 76 Ch/Cgh asteroids (grey circles). Those more precise than 50 and 20% are plotted as dark grey and black circles, respectively. Unreliable density estimates (below 0.5 g cm⁻³) are not displayed. The three binary asteroids, (41) Daphne, (121) Hermione, (130) Elektra, are labeled. The solid and dashed blue curves represent the average density (1.58 g cm⁻³) and 1 σ–2 σ (± 0.33 g cm⁻³) dispersion of the sample. The solid orange curve stands for the average density of CM chondrites at 2.13 ± 0.57 g cm⁻³ (3 σ).