Time evolution of the radial surface density profiles of planetesimals with a radius of 100 km for a disk ten times more massive than the MMSN. Solid lines represent the case with planetesimal fragmentation, dashed lines represent the case without it. For this last case, the planet achieves the critical mass at 4.07 Myr. When planetesimal fragmentation is considered, the planet does not achieve the critical mass. (Color version online.)