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Fig. 9.
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Entropy per baryon (red) and the degeneracy parameter Ψ (black), as a function of mass for the pre-collapse models (see Appendix B for details on the degeneracy parameter). The solid and dash-dotted lines correspond to the GENEC and MESA models, respectively. From left to right, we show the 15 M⊙, 20 M⊙, and 25 M⊙ models.
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