Fig. 11.
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Three-dimensional k-means clustering of the SN II sample with plateau durations (tPT) < 90 d, in the parameter space defined by the post-plateau decline rate (s1), the spectral line strength ratio (a/e_30d), and the absolute peak magnitude in V-band (MVmax). Different colours mark the two clusters identified by the algorithm, and the SN names are indicated for reference.
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