Physical structure of a ZP96 bubble of age = 500 yr with a stratified composition such that ω ≡ M_PN∕(M_WR + M_PN) = 0.03, with M_WR = 5.59 × 10²⁸ g and M_PN = 1.67 × 10²⁷ g, and with C = 3 × 10⁻⁷ erg cm⁻¹ s⁻¹ K^7∕2, Ṁ _sw = 5.0 × 10⁻⁷ M_⊙ yr⁻¹, and v_sw = 25 km s⁻¹. Shown are radial runs of electron, ion, total particle densities, and temperature. The central star is at the origin (radius = 0 cm), the wind reverse shock (= inner bubble boundary) is at 2.97 × 10¹⁶ cm, and the planetary nebula proper adjacent to the heat conduction front at 4.18 × 10¹⁶ cm. The compositions are those listed in Table 2: WR for hydrogen-deficient (grey) and PN for hydrogen-rich. The chemical discontinuity is at 3.98 × 10¹⁶ cm, or 2.0 × 10⁶ K. We note the logarithmic ordinate scales and the linear abscissa. For the meaning of the dots along the abscissa, see Fig. 15. See also Sect. 5.1 for details.