Fig. 4
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Synthetic spectra of M-type dwarf stars with Teff = 4000, 3600 and 3200 K (from top to bottom), log g = 4.5 and solar metallicity, at the Giraffe resolution. Spectra are plotted for A(Li) = −1.0 (black line), 0.0 (red line), +1.0 (green line), and +3.0 (blue line). The vertical dotted line shows the mean position of the lithium doublet.
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