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The critical interaction parameter χc plotted as a function of α. The different curves correspond to (a)Λ=0, (b) Λ=1.0, and (c) Λ=1.5. In all cases σ=25. Dashed lines indicate the approximation for large α in Eq. 10. The inset shows the same graphs for small α. Here the dashed lines correspond to the limiting behavior for small α according to Eq. 8. The open circle corresponds to the parameters used to calculate the phase diagrams in Fig. 4.
