NIR fraction (700–2200 nm) of the quasi-bolometric flux (340–2200 nm) for SE SNe. a) The values derived using optical/NIR data of five SE SNe are fitted separately (coloured solid lines), averaged, and interpolated (grey solid line and 1σ contours). b) The estimations from the BB fits to optical data are shown for five GRB-SNe along with the contours from the top panel. See main text for the references of the data sources.