NTT/SofI near-infrared spectrum of USco1621 B (black) overplotted with USco known members (coloured) obtained with Gemini North/GNIRS by Lodieu et al. (2008), for comparison. GNIRS spectra were convolved with a Gaussian function to match the SofI spectral resolution. The spectra have been normalised in the H-band region (wavelength range ~1.5–1.8 μm), and shifted by a constant for clarity. The regions affected by strong atmospheric telluric absorption bands are marked as grey bands. The most prominent spectral features are labelled.