Top: bolometric light curve for the 1D CMFGEN models 1D-X1 and 1D-X2b. Bottom: Mass density, initial 56Ni mass fraction, electron density, gas temperature, and hydrogen ionization fraction vs. velocity for models 1D-X1 (solid) and 1D-X2b (dashed) at 44 d after explosion. These two models vary in the outer ejecta structure, the inner core structure, and the 56Ni mixing adopted (strong or weak, presence or absence of a 56Ni-rich shell at a Lagrangian mass of 12 M⊙, corresponding to a velocity of about 4000 km s−1 in the resultingejecta). The two models have the same mass-density profile outside of the inner ejecta (with the exception of the regions beyond 10 000 km s−1), but different electron-density profiles because of the different 56Ni profiles.
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