SNe IIb (blue dots) and SNe II (orange dots) in the t_rise–ΔM₃₀ parameter space. Objects rejected through the spectroscopic reclassification method described in Section B.1 are marked with filled X symbols. Additionally, objects excluded after the σ-clipping procedure are shown with unfilled X markers. The number of SNe II and IIb in the sample is indicated, along with the correlation test result for SNe IIb.