Log of gas number density (upper half-plane) and temperature (lower half-plane) for simulation V16 of a star moving with v_⋆ = 16 km s^-1 through a uniform ISM, with units log  (n_H/ cm^-3) and log  (T/ K), respectively. The radial direction is vertical, and the axis of symmetry is R = 0, the z-axis. The solid black contour in the upper half-plane shows ionization fraction x = 0.5. The three panels show the evolution at different times, 0.025, 0.050, and 0.075 million years (Myr), respectively. The star is at the origin, denoted by a white cross. An animation of the simulation’s evolution is available online.