Scatter plot of planetesimal radius R vs. particle radius s for potential flow at 1 AU from the star. The scatter plot shows the result of streamline integrations of the same parameter space as in Fig. 3a, assuming particles bounce off the surface. After 10 bounces, particles are considered accreted. The red crosses represent a sticking fraction of f_stick< 0.1, the gray dots of 0.1 <f_stick ≤ 0.9 and the green crosses f_stick> 0.9.