Spectral region around the Li doublet for an RC star (upper panel) and an upper RGB star (lower panel), both members of Berkeley 32. The observed spectra are in black. The red lines show the synthetic spectra at the corresponding measured stellar parameters and A(Li) (+0.3 and −0.8 dex, respectively); the green lines show the synthetic spectra for the same parameters and A(Li) = −1.0. The vertical lines indicate the location of the two Li lines.