Semimajor axis of planetesimals at t = 300 kyr as a function of their initial formation zone for each gas profile and Saturn growth timescale for our two-planet model (top) and three-planet model (bottom). The color represents the moment the test particle was lost from the simulation, with cooler colors representing earlier loss and yellow for those that remain. The extent of Saturn’s “reach” is nearly identical across all simulations. The objects outside this reach, the somewhat horizontal yellow bar, will retain their initial semimajor axis, while planetesimals formed around Saturn may “leapfrog” over them to higher heliocentric distances.