Spectral modelling and comparison between SN 2020ue and SN 2011iv. Top panel: UV and optical spectra observed at a similar epoch (about six days before peak brightness) for SN 2020ue (black) and SN 2011iv (blue, Gall et al. 2018). Middle panel: Results from the TARDIS simulations (red curve) for the spectrum of SN 2020ue (black). Lower panel: Results from the TARDIS simulations (orange curve) for the SN 20211iv spectrum (black). The region between the two dashed grey lines corresponds to the wavelength range considered for the minimisation of the root-mean-square value (see Sect. 4).