Predicted evolution of [X/Fe] versus [Fe/H] in the Milky Way’s disk for O, Ca, Si, and the Fe-peak elements for the GCE models with N13 CCSN yields. The top and bottom panels show predictions with near- and sub-M_Ch SN Ia yields, respectively. For each element, LTE (panels without shading) and NLTE (shaded) observational data are plotted separately. The GCE tracks are colour coded according to the explosion mechanism (see text), where the grey line shows the evolution of [X/Fe] with no contribution from SNe Ia (i.e. assuming only a contribution to X from CCSNe). See Table 1 for the list of observational datasets used.