Fig. 5. Mean density of each of the 16 asteroids for which mass determinations have already been made, sorted by class; references of the masses used: (in brackets is given the asteroid number) [1] Viateau & Rapaport (1998), [2 and 4] Standish et al. (1995), [10] Scholl et al. (1987), [11] Viateau & Rapaport (1997), [15] Hilton (1997), [16] this work, [20] Bange (1998), [24] Lopez Garcia et al. (1997), [45] Merline et al. (1999), [121] this work, [243] Belton et al. (1995), [253] Yeomans et al. (1997), [433] Yeomans et al. (1999), [704 and 804] Landgraf (1992)