Effect of the 56Ni distribution upon the late phase [ Fe ii ]λ1.64 μm feature. Comparison of this feature from the +269d spectrum of SN 2012Z (black) to the expected line profile computed from the 5p0z22.16 model at +220d for two different 56Ni distribution. Plotted in blue is the synthetic spectra for the original model which has a hole in the 56Ni distribution of ≈3000 km s-1, while in red is the synthetic spectrum with 56Ni concentrated in the center.
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