Time evolution of the compactness parameter ξ2.5 (top panel) and evolution in ρc−Tc space (bottom panel) from oxygen depletion to the onset of core collapse. Solid curves correspond to 15 M⊙ models computed with η = 1.0, dashed and dot-dashed curves correspond to 25 M⊙ and 30 M⊙ models, respectively, computed with η = 0.33. The vertical dot-dashed line in the top panel indicates roughly the time of core silicon depletion (X(28Si) ≤ 0.01).
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