Stratification of density (top row), local Γ_rad, gas-to-total pressure ratio β, and convective flux fraction (bottom row) for models on the H-ZAMS. The five columns represent initial masses from 15–200 M_⊙. The blue shading indicates convective areas. The plot illustrates the envelope response as Γ_rad nears the Eddington limit, leading to inflated morphology for the highest masses. All models are in hydrostatic and thermal balance.