Comparison of model light curves and spectra with the observations of iPTF13bvn. Top: photometric data (black symbols) shifted in time by +8 d and in magnitude by −0.5 mag as well as the results for model logP2p75 (solid line). With such shifts, data and model are in close agreement at V-band maximum. Middle: Same as top but for the model he4 of Dessart et al. (2020), now with a shift in time of +6 d. Bottom: comparison of multi-epoch spectra at about 5, 15, 30, and 85 d after explosion between the observations of SN iPTF13bvn and models logP2p75 and he4 (no time shift has been applied to the observed spectra).