Effects of non-equilibrium (thermo)chemistry. Left: composite colour image as per the right hand panel of Fig. 5, after 6507 yr of additional evolution without hydrodynamics. Centre: estimate of where the rate of advection of H₂ into the wind dominates over its in situ formation on dust grains. Right: the adiabatic cooling as a fraction of the total thermochemical cooling (N.B. white regions are where PdV work instead heats the gas). In each panel, the solid purple line is the sonic surface.