Planetesimal accretion rates as a function of time for an embryo located at 5 au in a disk ten times more massive than the MMSN, where initially all the solid mass is deposited in planetesimals of 100 km of radius. The black dashed line corresponds to the case without planetesimal fragmentation. The red solid line corresponds to the total planetesimal accretion rate with planetesimal fragmentation. The accretion rate of planetesimals with a radius of 100 km is plotted as a green solid line. We also plot the accretion rates for other planetesimal sizes. (Color version online.)