Montage of optical spectra (and UV when available) for a few observed SLSNe Ic and a subset of models. For Gaia16apd, the spectrum combines the UV and optical spectra, which were taken two days apart. Labels indicate the SN name and the rest-frame post-maximum epoch. Top panel: 1 − 4 d prior to maximum. Bottom panel: phase about 35 − 65 d after maximum. At the time of maximum, most models reproduce the O II and C II lines typical of observed SLSNe Ic. However, a month later, only the clumped ejecta model r0e2cl reproduces the observations, which exhibit uniform spectral properties.
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