Comparison of the late-time [Fe X] 6374 Å line profile (solid) with [O III] 4363 Å (dash) on JD 55 369 in the NOT sequence. The spectra are scaled for superimposure. The line may also be blended with Si II 6347 Å and this comparison shows that the [O III] line was more symmetric than the usual shock features and extended to about 350 km s-1 from the rest velocity.
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