caption: The figure is a plot of Pressure, p, on the vertical axis as a function of volume, V, on the horizontal axis, at five different temperatures. The curves all start at high pressures for the lowest volumes and decrease. The upper two curves, in red, decrease monotonically, with gradually decreasing slope. These curves are marked as having T greater than T c. The middle curve, in purple, is marked T c. This curve decreases rapidly, has a saddle point, and then continues to decrease gradually. The lowest two curves, in blue, decrease to a narrow minimum, then increase to a broad maximum, and then decrease gradually. These curves are marked as having T less than T c. The pressure minima of the lower curves occur at volumes slightly lower than the volume at which the T c curve saddle point is found.
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