Progression of the optical spectrum for SN 2023xqm. Each spectrum has undergone de-reddening based on the host galaxy’s characteristics and redshift data. The time indicators on the spectra’s right-hand side denote the days elapsed since the B-band’s peak luminosity. The vertical dashed lines pinpoint the absorption troughs of the Si II 6355 feature in SN 2023xqm’s spectrum, observed around t ∼ +0.0 days.