Left: observed cumulative distributions of 12 + log(O/H) for different SN subtypes. Colour-coding is as follows: SNe Ic blue,Ib green, IIb orange, IIn purple, II red, and SESNe (Ic + Ib + IIb combined) dashed cyan. For comparison, the literature distributions of SN IcBL (dashed line), SLSN-I (dash-dotted line), and SLSN-II (dotted line) are also shown. Right: matrix for the K–S test result between different SN subtypes. The colour bar indicates the probability that samples were drawn from the same metallicity distribution, where the black end indicates significantly different distributions.
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