Spectral sequences of SN 2018jmt (top) and SN 2019cj (bottom). The position of the principal transitions from H and He I are highlighted by the dashed vertical lines. The ⊕ symbols mark the position of the strongest telluric absorption bands. All spectra have been corrected for redshift and extinction. In some cases, spectra with lower S/N have been smoothed using a Savitzky-Golay filter (indicated by the gray line).