Fig. 2.

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Spectra of SN 2021foa. Left: sequence of spectra of SN 2021foa. The spectra are redshift- and reddening-corrected. The principal identified lines are marked, as are the telluric absorption bands. The phases indicated are relative to the V-band maximum. For a better visualisation, the fluxes of the late spectra are multiplied by the factor reported in parentheses. Right: zoomed-in view of the Hα line at three representative epochs, −10 d, +37 d, and +79 d, to highlight the evolution and the complexity of its profile. In abscissa are the rest-frame velocities.
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