Normalised, co-added, RV-corrected, unveiled spectrum of CS 22876–032A (blue dots), together with best-fit 3D-NLTE Li profile (red circles), and residuals of the fit (lower panel). The mean flux uncertainty is shown on the right as a blue circle with error bars. The horizontal dashed and dot-dashed lines indicate the 1σ dispersion of the observed flux points relative to the mean difference observed minus computed profiles.