Shell details for the final snapshot of run 3S1-hr. Shown is an X-Y zoom of density, pressure, temperature and Mach number, as indicated on the individual panels, around the position of the maximum density, which is located at (X,   Y,   Z) = (−30,   −79,   −52) pc. Velocity vectors are overlaid on the density plot. The high density region is overpressured and has a temperature below 20 K. See text for more details.