Fig. 3.
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Optical spectra normalized at 9250 Å on a linear scale in the alkali metal line region (Cs, Na and K, two top panels), and the hydride band regions (FeH and CrH, two bottom panels) of the two T subdwarf candidates and WISE1810 compared with three T dwarf templates. We did not plot the spectrum of WISE1810 because of its low signal-to-noise ratio.
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