Temperature and density structure of the 150 km s⁻¹ shock in the unmixed 10 M_⊙ model with ρ₀ = 8.4 × 10⁻²² g cm⁻³. The density and temperature of the electrons (n_e, T_e) and ions (n_i, T_i), as a function of the ion column density swept up by the shock, are plotted as the solid and dashed curves, respectively. The extent of the hot post-shock region (B), the thin cooling layer (C), and the photoionization region (D) are indicated by the gray/white bands.