Spectra of two M-type dwarf stars with T_eff ~ 3500 K and solar metallicity observed with Giraffe. The upper and lower spectrum correspond to a fully depleted star (A(Li) < −1.0) and to a star with A(Li) ~2.0, respectively. The spectra are normalised to their average flux and the upper one has been arbitrarily shifted upwards by 0.25 for clarity. The vertical red dotted line marks the mean position of the lithium line.