Combined FFDs (grey) for the observed (first and third panels) and corrected (second and fourth panels) samples. ED-based FFDs are shown in the first and second panels, and E_bol-based FFDs in the third and fourth panels. Power-law and lognormal fits are shown with dashed red and green lines, respectively, while truncated power-law fits for the E_bol-based FFDs are shown with dashed blue lines. The dashed vertical grey lines mark the truncation thresholds t₁ and t₂. The shaded green areas correspond to the abiogenesis zone (AZ) (Rimmer et al. 2018). The shaded light and dark red areas correspond to the permissive and conservative thresholds of the ozone depletion zone (OD) (Tilley et al. 2019), respectively.