NIR spectrum of WISE J0720 (black; gray for the region with λ ≥ 20 000 Å that is not used for spectral typing because of the poor wavelength calibration, see Sect. 2.2) compared with templates from the IRTF library (red; Cushing et al. 2005; Rayner et al. 2009). As in Fig. 2, the cosmic ray hit region is omitted.
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