Comparison of synthetic spectra from the he4p0 model with the observed spectra of SN 2024acyl obtained after the o-band maximum light. No smoothing has been applied to either the observed or the synthetic spectra. The synthetic spectra are based on simulations by Dessart et al. (2022) and Wang et al. (2024a), as well as on newly computed models incorporating updated parameters. The model spectra have been scaled to match the resolution of the observed spectra.