Fig. 5
Left: optical spectra of USco16m25 (black) obtained with the R1000R grating on GTC/OSIRIS. Overplotted in red are USco spectral template of spectral type M5, M5.25, and M5.5 kindly provided by Kevin Luhman. The top spectrum represents a combination of the normalised spectra of an M5 and an M6 member of USco. Right: zoom-in on the lithium absorption line at 6707.8 Å (marked with a vertical dashed red line) of USco16m25 (black) obtained with the R2500R grating on GTC/OSIRIS.
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