Evidence ratios for the specified model comparisons in increasing complexity. The format of the vertical stacks follow the metallicity convention introduced in Fig. 1, but are now coloured according to the evidence ratios, as is indicated by the colour bar. The Jeffreys scale for model comparison (Jeffreys 1961) is indicated on the colour bar, where beyond |dlog(Z)| ≳ 10 we have overwhelming preference for one model over the other. On the contrary, when |d log(Z)| ≲ 2, no significant preference for either model over the other is found. The levels where |dlog(Z)| ≃ 2 and 5 indicate significant and decisive preference, respectively.