Observed spectra of candidate late-L and -T subdwarfs from Tables 2 and 3. Spectra are normalized at the J-band (1.25–1.28 μm) flux peak and offset by a constant (dashed lines on left and right edges). Source are ordered from bottom to top by increasing H-band CH₄ band strength. The left panel shows the full 1–2.5 μm spectral data, while the middle and right panels focus on the 1.23–1.265 μm J-band and 2.0–2.3 μm K-band regions. In the left and right panels, the full-resolution data are shown as gray lines and smoothed spectra (λ/Δλ ≈ 125) as black lines, and are compared to low-resolution dwarf spectral standards (magenta lines) drawn from J. D. Kirkpatrick et al. (2010) and A. J. Burgasser et al. (2006b), with corresponding types indicated next to each source label. The middle panel shows only the full-resolution data compared to medium-resolution spectral standards from C. A. Theissen et al. (2022) in magenta. Note that IRTF/SpeX and Magellan/FIRE data J0911+2146, and J0953−0943 (the latter three are in Figure 4) are not smoothed, as their native resolution is λ/Δλ ≈ 100–300. The K-band spectra are re-scaled to highlight structure in this region.

(The data used to create this figure are available in the online article.)

(The data used to create this figure are available.)