S Ori 70 and S Ori 73 HST/WFC3 spectra (solid red line) plotted along with flux uncertainties (reddish shaded area) as given by the reduction software. Low-resolution spectra of field T dwarfs are shown with thin solid lines. In the left panel, comparison spectra correspond to 2MASS IJ0243137+245329 (T6, Burgasser et al. 2004b), 2MASS IJ0727182+171001 (T7, Burgasser et al. 2006), and 2MASS IJ0415195−093506 (T8, Burgasser et al. 2004b). In the right panel, there are 2MASSJ 12095613−1004008 (T3, Burgasser et al. 2004b), 2MASS J2254188+312349 (T4, Burgasser et al. 2004b), and 2MASS J04070885+1514565 (T5, Burgasser et al. 2004b). The most prominent molecular features are indicated. All spectra are normalized to the fluxes of S Ori 70 and S Ori 73 at 1.262–1.274 μm.