Medium-resolution NIR spectra of WISE J0720 (left) and the radial velocity standard HD 48381 (right). The different orders are plotted with alternating dark/light blue and red/green colors, respectively. The low-resolution NIR spectrum of WISE J0720 is shown in magenta. For comparison we plot the M9V LP 944−20 (left, black) and K0V HD 145675 (right, black) spectra from the IRTF library (Cushing et al. 2005; Rayner et al. 2009), shifted down by 0.9 (top panels), 0.5 (middle) and 0.3 (bottom). All spectra were normalized to unity for λ between 15 000 Å and 17 000 Å.