Observed spectra of the the programme stars #042, the most Li-rich star in our sample; #030, a Li-detected star; and #051, a Li-poor star (black dots, from bottom to top). For clarity, the spectra of stars #030 and #051 have been shifted by +0.2 and +0.4 in flux. The continuous line is the best-fit synthetic spectrum to star #042 with a Li abundance of log ϵ(Li) =  +3.2. The two dotted vertical lines indicate the laboratory wavelengths of the hyperfine transitions in ⁷Li. Note also the good fit to two Fe lines at  ~670.55 and  ~671.21 nm, which indicates a well-determined metallicity of  [M/H]  =  −0.85 for star #042. The metallicities for the two other stars were determined to be  − 0.94 (#030) and  −1.03 (#051), respectively.