Shane/Kast optical spectra (black lines, normalized at 7400 Å) of (from top to bottom): TOI-1743, TOI-5799, and TOI-6223. Best-fit SDSS standard templates (Bochanski et al. 2007) are shown as magenta lines. The key spectral features in the range 4200–8900 A are labeled, including the location of the (corrected) O₂ telluric A-band at 7500 Å (⊕). The zoomed-in regions around the 6563 Å Hα and 6708 Å Li I lines are shown in the insets. The 5600–5900 Å gap is due to the dichroic separation between the blue and red channels of the Kast spectrograph.