Low-resolution optical spectra of 2M0418 obtained with the R300R (three spectra) and R1000R (third from bottom) gratings on GTC/OSIRIS (black lines). The continuum of the spectra are offset vertically by 1.5 for visualization purposes. From top to bottom: we overplotted the spectra of 2MASS J00361617+1821104 (L4; green), the Sloan dwarf template (L5; red), the spectrum of SDSS J053952−005902 (L5; red), and 2MASS J08251968+2115521 (L6; green). See text for details.
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