Fig. 3

Parametric plots of the standard deviation of the relative occupancy, \(\sigma\), versus the mean relative occupancy, \(\langle \varphi \rangle\), for different values of the interaction potential: from \(J=-10\) (bottom curve) to \(J=10\) (upper curve) in steps of 1. Plots (a) and (b) correspond to systems of size \(L=13\) and \(L=14\), respectively.