The best-fit V envelope for the Merxia family (C₀ = 3 × 10⁻⁵ au, red lines; the black dots are the HCM family members). Asteroid 808 Merxia is perfectly centered in the V-shaped envelope and is likely the true largest member in the family. Asteroids 1327, 6633, and 50694 are suspected interlopers. The Merxia family age is estimated to be ∼500 Myr from Equation (3), but the previous detailed Yarkovsky–YORP chronology modeling established t_age = 250 ± 100 Myr (D. Vokrouhlický et al. 2006). This illustrates a case where the V-envelope method can significantly overestimate the true age of a family (due to the neglected effect of ejection velocities).