Fig. 3. (Color online) The $P-\delta V_{\rm Reg}$ diagram for $d=4$ and $Q=0.1$. The temperature of the isotherms increase from bottom to top. The upper dotted (black) line corresponds to the ideal gas. We have one phase for $T > Tc$. The critical isotherm $T = Tc=0.44$ is denoted by the dashed (red) line. The lower (blue) solid lines correspond to temperatures smaller than the critical one $T <Tc$.
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