Fig. 11.
Ratio of [Ca II] λλ 7291, 7324 to [O I] λλ 6300, 6363 for a sample of core-collapse SNe and Ca-rich events; the ratio is significantly larger in Ca-rich objects. SN 2019bkc is shown in green calculated for two velocity positions, 0 km s−1 and if it has the same offset as the [Ca II] and Ca II lines. Ancillary data from Valenti et al. (2014).
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