Fig. 2.

(A–D) Landau’s parameters optimized for systems with (A) $N=128$, $n_M=3$ and thus $\mathrm{\Lambda }=4.267$; (B) $N=2,048$, $n_M=3$ and thus $\mathrm{\Lambda }=10.75$; (C) $N=2,048$, $n_M=19$ and thus $\mathrm{\Lambda }=4.272$; and (D) $N=8,192$, $n_M=3$ and thus $\mathrm{\Lambda }=17.07$. Data at temperatures where convergence was not clearly reachable are omitted. The linear fits are obtained using only data at $T>0.95T_c$, and error bars are smaller than the data points.