SALT-RSS spectrum of TUVO-21acq. The spectrum is wavelength calibrated, background subtracted, and with relative flux calibrations applied. Emission lines from hydrogen Balmer series and from helium are labelled. The gaps at ∼4500 Å and ∼7800 Å represent gaps in the chip. The emission feature at ∼5577 Å and the absorption feature at ∼7600 Å are both atmospheric features that are not fully removed by the flux calibration. The entire spectrum is shifted towards the red by 2.0 Å as this was the error we found on the wavelength calibration using the 5577.3 atmospheric oxygen line.