Kernel density estimate for starting time t_ini = 0 Myr. Thered lines are for the pebble model and the blue lines for the planetesimal model. Shown are the results for the two partitions of the amount of solids: solid and dashed lines are used when ε = 0.9, while dotted and dash-dotted lines are used when ε = 0.5. The kernel density estimates were obtained using a Gaussian kernel with a normal reference rule bandwidth (Scott 1992).