Star-forming [O/Fe] – sSFR relation including the sample from Bresolin et al. (2016, 2022) with BSG-based metallicities, assuming they probe Z_Fe. Data points (big circles) were shifted to a common ‘intermediate+Δ_d’ [O/Fe] baseline. Inner colour of big circles indicates the stellar mass, outer colour indicates the bin to which the data point belongs. Values listed in the figure indicate median [O/Fe] in each of the log₁₀(sSFR) bins (see Table D.1 for the values found with different [O/Fe] baseline choices). Dark (light) area of each bin spans between 16-84 (0.13-99.87) percentiles of 10⁵ draws of the average [O/Fe]. Small grey data points were not used in the analysis as it is not clear how to consistently correct them for systematic offsets. Data with indirect O or Fe estimates are not shown. Thick horizontal lines indicate zero points for reference solar O and Fe abundance from Grevesse & Sauval (1998) (GS98) and Asplund et al. (2009).