Comparison between observed spectra of the class III sample and their respective BTSettl models. Left: extinction-corrected Asiago spectra (black) with contemporaneous photometry (orange points). BTSettl models corresponding to the optical Teff are shown in blue. The filled light blue regions highlight the NIR flux that is underestimated by the models. Right: as in the left panel but assuming Av = 0 and BTSettl models corresponding to the Teff measured from NIR high-resolution spectra (López-Valdivia et al. 2021). Source names and Teff are labeled for each spectrum.