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Fig. 3.

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Spectral evolution of SN 2021ckj. Top panel: early spectra of SN 2021ckj (red), compared with the other Type Icn SNe 2019hgp (gray) and 2021csp (black). Bottom panel: same as the top panel, but for the late-time spectra. For comparison, the spectra of SNe 2020bqj (Ibn; Kool et al. 2021), 2020uem (IIn/Ia-CSM; Uno et al. 2023), and 2021foa (IIn; Reguitti et al. 2022) are plotted. These data were obtained through WISeREP (https://www.wiserep.org/object/17712).

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