Top: maximum temperature reached by each mass shell for three different progenitors: a 120 M_⊙, a 25 M_⊙, and a 18 M_⊙ model from WH07 (black), LC18 (red), and F23 (blue), respectively. All are single, nonrotating, at solar metallicity, and all have ξ_2.0 ≈ 0.26. Middle: three progenitors with similar M_CO ≈ 6.15. The WH07 progenitor is the 23 M_⊙ model, the LC18 progenitor is the 020b300 model (following the naming convention in Table 1), and the F23 model is the 20 M_⊙ single-star progenitor. Bottom: three single-star, nonrotating, solar metallicity 25 M_⊙ models.