Completeness of retired galaxies in terms of z, and M_*. The coloured map illustrates the 5th percentile of sSFR₉ on each z–M_* bin. Each bin includes the (uncorrected) fraction of retired galaxies with respect to the total, based on the classification that maximises the F-score. The dashed and solid lines denote the mass completeness limit above which retired galaxies are detected. Each line tracks the lower envelope that satisfies sSFR₉ < 10⁻¹¹ yr⁻¹ and sSFR₈ < 3 × 10⁻¹¹ yr⁻¹, based on the 5th and 1st percentiles, respectively.