Flux ratios (top), residuals (centre), and $\stackrel{\sim }{z}$-scores (bottom) for B/C (blue circles), Be/C (green downward triangles), Li/C (orange squares), and fluorine (purple upward triangles). The models (top panel) have been calculated for the updated OPT12 (dashed grey line), OPT12up22 (solid black line), and OPT22 (dashed-dotted grey line) from the best-fit transport parameters of the combined analysis of all three species. In the middle and bottom panels, the residuals and $\stackrel{\sim }{z}$-score are shown for the OPT12up22 configuration only. The distributions in the right-hand side of the bottom panel are histograms of the $\stackrel{\sim }{z}$-score values (projected on the y-axis) compared to a 1σ Gaussian distribution (solid black line) (see text for discussion).