Spectra of SN 2023ixf at days ∼5 (a), 40 (b), 150 (c), and 330 (d) compared to that of the Type IIP/L SNe 2013ej (Valenti et al. 2014; Yuan et al. 2016; Huang et al. 2015), 1999em (Leonard et al. 2002), 2017gmr (the spectrum at day 312 is binned; Andrews et al. 2019), and 2006ai (Hiramatsu et al. 2021) at similar phases. In each panel, major spectral features are marked by vertical dashed lines. For a better display, all spectra were shifted arbitrarily and presented in a logarithmic scale.