AMD stability of the simulated systems. Each planet is represented by a circle, the size of which is proportional to the mass of the planet. The color represents the AMD stability coefficient, β (in log scale), of the inner pair associated with the planet. The innermost planet is represented by the AMD stability coefficient associated with the star. Numbers in the simulation names (y-axis) are random, but the systems are ordered by their initial disk mass value, which decreases from top to bottom. Systems starting with the disk mass = 5 M_⊕ contain only one or two very small planets and are therefore not included in the plot (but they are AMD-stable).