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(Color online) Left panel: A random-sequential-addition (RSA) packing of hard, identical circular disks in two dimensions with a packing fraction ϕ = 0.54, which is close to the saturation state. Right panel: An equilibrium system of hard, identical disks at ϕ = 0.54. The fact that neither of these systems is hyperuniform, as discussed in the text, indicates that hard-core exclusion effects alone are not sufficient to induce hyperuniformity.
