The dust (upper) and gas (lower) temperatures as functions of radius inside the subcritical (left) and supercritical (right) 5-M_⊙ Bonner–Ebert spheres. Red and green points (mostly obscured) are the same as in Fig. 6. For the blue (without the UV ISR) and magenta (with the UV ISR) points, the ISM physics is exactly the same, except that it includes thermal collisional coupling between the gas and the dust. The black solid lines give the results obtained by Keto & Field (2005) without including the UV ISR. The effect is that at high densities, the gas essentially adopts the dust temperature. The small ‘spikes’ in the gas temperature in the right-hand plot at radii r ≈ 0.03–0.16 pc are due to the artefacts in the calculation of the SPH density due to the particles being set up on a radially-perturbed cubic lattice.