Six key timestamps demonstrating sequential planet formation in one of the simulations with α = 5 × 10⁻⁴. Each panel shows the radial profiles of the gas surface density ∑_g (solid line), the dust surface density ∑_d (dashed line) and, the mass m and the semimajor axis r of the massive bodies (dot) at the noted time. The final panel also shows the massive bodies from the rest of the simulation set with each colour showing one of the five simulations.