The graph on the right is a plot of T vs v calculated from the equation at four constant pressure values. On the red isobar, p = 2 p c , the slope is positive over the entire range, b ≤ ≤ v < ∞ ∞ (although the plot only shows a finite quadrant). This describes a fluid as a gas for all T , and is characteristic of all isobars p > p c . The green isobar, p = 0.2 p c , has a physically unreal negative slope, hence shown dotted gray, between its local minimum, T m i n , v m i n , and local maximum, T m a x , v m a x . This describes the fluid as two disconnected branches; a gas for v ≥ ≥ v m i n , and a denser liquid for v ≤ ≤ v m a x ≤ ≤ v m i n .