Optical spectroscopic time-series of ASASSN-20jq. Positions for telluric oxygen absorption are marked by ⊕ symbol and light-grey bands. The vertical dashed lines are at rest-wavelengths for corresponding lines as labeled. Thick dashed lines represent Fe multiplets. An archival SDSS host galaxy spectrum, centered 3$\stackrel{″}{.}$0 away from the SN location, is also included as a reference to show emission lines contamination from the background light in some of the late SN spectra.