Initial (dashed lines) and final (solid lines) size-number distributions of the cold bodies from a simulation that begins with Π = 4.4, q_m = 2.9, q_s = 6.3, and γ = 3.6. The simulation also includes hot, resonant, and scattering populations, which are not plotted here for clarity, but for which the overall evolution is similar. Collisional evolution is largely confined to sizes smaller than ~500 m. The number of small bodies increases in bins that lie farther out, even as the total mass declines as the γ parameter pushes the mass distribution towards smaller sizes. The Π parameter creates the larger discontinuity between the first and second radial bins.