Supernovae counts and EE percentages under specific criteria. The number of SNe IIb satisfying specific criteria for observational point density (ρ_peak > ρ_TH, left panel) and explosion epoch error (δt_exp < δt_TH, right panel) are shown as unfilled bars. Blue-filled bars represent the subset EE SNe. The dashed pink line indicates the percentage of EE SNe for each criterion, with numerical percentages displayed above the bars.