Fig. 4.

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Montage of spectra for the set of explosion models at 200 d after explosion (each spectrum is normalized so that the maximum flux is unity). There are strong variations in the iron forest between 4000 and 5500 Å, and in the strength of [N II] λλ 6548, 6583, [N II] λ 5755, [O I] λλ 6300, 6364, [Ca II] λλ 7291, 7323 and Ca IIλλ 8498 − 8662. The models are based on the He-star progenitors evolved with the nominal mass loss rate (Woosley 2019; Ertl et al. 2020).
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