Time sequence of SN 2024acyl spectra. Some prominent features, such as He I, He II, and N III, are marked with vertical lines, while the strongest telluric absorption bands are indicated with the ⊕ symbols. The phases reported to the right of each spectrum are from the epoch of o-band maximum light (MJD = 60652.49 ± 0.26; 2024-12-08). Spectra with a low S/N were binned with 20 Å each bin; the original (unbinned) spectra are displayed in lighter colours behind. Reddening and redshift corrections have been applied to the spectra.