Top: Hα (solid) compared to [Ne III] 3869 Å (scaled by factor of 1.5) (dash) showing the filamentary structure of the ejecta and possible variation of the Ne/H ratio; Middle: [Ne III] 3869 Å and [O III] 5007 Å line profiles compared, bottom: ratio of the neon and oxygen profiles. This, in contrast, shows the likely uniformity of the Ne/O abundances in the ejecta. See text for discussion.
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