ALFOSC spectrum of TOI 263 with a resolution of 16.6 Å is plotted as a red line. It is compared to the spectra of three spectral standard stars from the catalogue of Alonso-Floriano et al. (2015), which are shown with a black line: GJ 2066 (J08161+013, M2V), Luyten’s star (J07274+052, M3.5V), and V1352 Ori (J05421+124, M4V). All spectra are normalised to 1.0 at the red continuum of the subordinate Na I lines, and are shifted vertically by 1.0 for clarity. The strongest molecular and atomic features are indicated on the top. The strongest telluric oxygen features are also labelled.