(color online) (a) Average packing fraction ϕ as a function of pressure p for different system sizes (specified in the legend) in two-dimensions. The solid lines are guides for the eye. (b) Distributions of ϕ, P (ϕ), at p = 10⁻⁵ for different system sizes. From the left to the right, N = 16, 64, 256, and 1024, respectively. Inset: system size N evolution of the gap of the jamming transition thresholds between infinitely large and finite size systems, ϕ_J∞ − φ_J. The thin line is a guide for the eye. The short thick line has a slope of −0.616.