Mass-distance diagram of the nominal synthetic population NG76 of solar-like starts which stars with initially 100 moon-mass embryos per disc (see Paper II). The epochs of 0.1, 0.5, and 1 Myr are shown. Coloured points show protoplanets that can no longer accrete planetesimals of the initial local reservoir, which have a planetesimal accretion timescale of less than 3 Myr, and which are still embedded in the parent gaseous disc. When , the planetesimal accretion of these planets could in principle be affected by shepherding if they would be the only protoplanets growing in the disc.