Snapshots of the image plane for simulation HV04 (left) and WV04 (right) showing log of gas number density (upper half-plane) and temperature (lower half-plane). The units are log (n_H/ cm^-3) and log (T/ K), respectively. A contour showing H ionization fraction, x = 0.5, is also plotted in black in the upper half-plane. The symmetry axis is horizontal, labelled z; the star is at the origin indicated by the white cross, and the ISM is flowing past from right to left at 4 km s^-1. Both simulations are plotted at time t = 0.4 Myr.