![ Hydrodynamic simulation of a rapidly outflowing water vapor atmosphere. The panels show as functions of altitude the outflow speed (*upper-panel*) and the densities of selected neutral (*middle-panel*) and ion (*lower-panel*) species. In the upper panel, the sound and escape speeds are shown and all three lines cross at the same location, as required for a pressure driven Parker wind. []{data-label="fig:Case5"}](NeutralDensityCase5.pdf "fig:"){width="45.00000%"} ![ Hydrodynamic simulation of a rapidly outflowing water vapor atmosphere. The panels show as functions of altitude the outflow speed (*upper-panel*) and the densities of selected neutral (*middle-panel*) and ion (*lower-panel*) species. In the upper panel, the sound and escape speeds are shown and all three lines cross at the same location, as required for a pressure driven Parker wind. []{data-label="fig:Case5"}](IonDensityCase5.pdf "fig:"){width="45.00000%"}

[ccccccccccccc]{} 1 & 18.4 & 98.7 & 231.3 & 256.2 & 310-840 & 3.71 & 6.21 & 2.25 & 0.075 & 0.272 & 0.861 & 0.402\
2 & 22.9 & 124.5 & 252.5 & 302.6 & 180-790 & 4.78 & 6.87 & 2.00 & 0.091 & 0.367 & 0.853 & 0.494\
3 & 30.0 & 166.0 & 280.9 & 373.4 & 93-730 & 6.38 & 7.73 & 1.72 & 0.12 & 0.529 & 0.868 & 0.613\
