Grain sizes of eroded mass and dust released in gross fragmentation vs. mass lost in such events. Lower grain sizes are shown with ▲, upper grain sizes are shown with ▼. The disks show the sizes of the non-fragmenting parts and lie on a line with a slope of 1/3. Some of the disks lie below this line due to the multiplicity of these fragments (see the text for details). Both axes are logarithmic.