Fig. 1.
Full GTC/OSIRIS spectrum of the Hyades L5 dwarf 2M0418 (black) calibrated in flux with the standard deviation from the ten individual optical spectra (gray). The right-hand plot shows a zoom on Hα in emission and lithium in absorption. Overplotted in red is the optical spectrum of the field L5V dwarf 2MASS J12392727+5515371 which exhibit lithium in absorption (Kirkpatrick et al. 1999).
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