Fig. 4.
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Cumulative distributions for the D16, N2, and O3N2 oxygen abundance indicators of the different types of CCSNe. The right column shows the Kolmogorov–Smirnov (KS) statistic matrix for the combination of the different SN types. The legend gives the number of SNe used in each distribution and the median oxygen abundance is marked as the dashed linse. The color scale and the matrix values report the KS p-values.
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