Radial profiles of the density, temperature, degeneracy, and electron fraction at different times. The horizontal axis is the mass coordinate in solar mass units. The left, middle, and right columns correspond to the 15, 12, and ﹩9\ {M}_{\odot }﹩ models, respectively. Different colors denote the times when the central density becomes ﹩{\mathrm{log}}_{10}{\rho }_{c}/[{\rm{g}}\ {\mathrm{cm}}^{-3}]=6﹩ (black solid), 8 (blue solid), 10 (green solid), 12 (purple dotted), and 13 (red dotted), respectively.