Slope of the linear fit to the [O/Fe]–log₁₀(sSFR) relation for different choices of the baseline (colours) and including/excluding of the sample from Bresolin et al. (2016, 2022) at low sSFR (crosses/circles). We show the result obtained when fitting only the slope at log₁₀(sSFR) <  − 7.6 (symbols with grey edges), at log₁₀(sSFR) <  − 8.5 (symbols with blue edges) or when fitting the slope to the full sample (black edges). Error bars range from 16 to 84 percentiles of the fits, the symbol indicates the median.