Notes. H is the absolute magnitude, and δH its uncertainty, for objects detected by CSS and used in our simulation of the unbiased size frequency distribution of small fragments in the Datura family. Magnitudes of the first five objects were determined by our observations. Those of 90265, 89309 and 215619 used the measured H_R and colors V−R (see Table 6). In the case of 60151 and 203370 we measured only H_R, and assumed V−R = 0.46 mag, namely a weighted average of the measurements reported in Table 6. For fainter asteroids we augmented the MPC values by 0.3 as explained in the text.