First and second core mass (a) and radius (b) for all 143 runs. Each mass and radius has a starting and an end point. The starting point represents the quantity when the core has just formed, while the end point is at the end of the simulation. A small arrow in the middle of each segment points in the direction from start to end. The vertical alternating grey and white bands indicate changes in initial radius (see panel b) for values of R₀).