Same as Fig. 4 but for restricted wavelength ranges (from top to bottom): optical (0.35–1 μm), NIR (1–5 μm), lower MIR (5–14 μm) and upper MIR (14–28 μm). The ℱ_X−Y μm label gives the fraction of the total optical to MIR flux (0.35–14 μm) for SN 2021aefx emitted within the wavelength range of each plot. We include line identifications based on their Sobolev EW (see Table 2). Transitions connected to the ground state are marked with a ‘†’ symbol. For consecutive lines within a multiplet (connected by a horizontal line), we give the gf-weighted mean wavelength of the transitions. Lines that only appear in one model class are labelled with the corresponding colour.