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Fig. 14

image

N II emissivity in model 12C at 400 days (red), and the N II photons that emerge in the radiative transfer simulation (blue). Note how much of the [N II] λ5754 emission is absorbed (by Na I D in the He envelope), producing a blueshifted feature as seen in the observed spectra (Fig. 13). Total emergent spectrum is shown in black.

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