Results of the analysis of the lithium resonance doublet in the CFHT spectrum of HD 123351. The upper panel shows the ⁶Li/⁷Li ratio for each line list derived with 3D CO⁵BOLD and 1D LHD model atmospheres (left and right part respectively). The model parameters are indicated on the bottom axis. Different symbols correspond to different fitting ranges; squares for the Full range, stars for the Li range. The error bars are the formal 1σ internal fitting errors on the free parameter ⁶Li/⁷Li and do not indicate the final uncertainty of the measurement. The quality of each fit is shown in the lower panel where the bars represent the reduced χ² value.