Figure 7.

The simulated phase diagram of Eq. 9 in the regime of small γ. Plotted is 1/J_∞ versus γ, which separates the fluid phase from the lo/ld coexistence region (squares indicate the results of our finite-size scaling analysis, the dot marks the exact location of the two-dimensional Ising critical point). For γ < γ_tri (γ > γ_tri), the transition between the fluid and the lo/ld region is two-dimensional Ising-critical (first-order). Based on the scaling analysis of Fig. 6c, we estimate the tricritical point to be ∼ γ_tri ∼ 0.6–1.0. To see this figure in color, go online.