Temporal evolution (20 Myr) of the total planet mass (sum of all planetary bodies with M_P > 0.5 M_⊕ in a system) in the simulated system called 73 Sim (initial disk mass = 25 M_⊕, central mass = 0.8 M_⊙, gas surface density = 1250 g cm⁻²). Shown are the evolutionary tracks of four simulations with exactly the same parameters. The total mass included in Fig. 9 is the final state of 73_1 Sim, represented by the blue line.