Disk accretion rates measured at r = 0.6 au, a location interior to all planets at all times. Each data point represents an average over 20 years (see Section 2.1). Left: gas-rich α = 0 simulations (model 2 in black, 3 in red). Right: gas-poor α = 0 models (4–6 in black, red, and blue, respectively). At t ≲ 1000 years, accretion rates agree with predictions from Equation (6) to within a factor of 2. Variations in ﹩\dot{M}﹩ at later times reflect planet migration (compare with Figure 1) and deepening of gaps.