Contours of the gas density after 90 binary revolutions. Results with an energy equation are shown in the left part of this figure, and those with a locally isothermal equation of state with a fixed temperature profile are shown in the right part. The upper plots are for e_b = 0.4 and the lower plots for e_b = 0.0. The same initial aspect ratio (h = 0.05) is used in these simulations.