Predicted atmospheric C/O number ratios of the planet simulated in the disc of WASP-84 as a function of initial position for a disc of α = 5 × 10⁻⁴ (left) and α = 1 × 10⁻³ (right). The dashed red line shows the best-fit formation location based on the heavy element mass, and the grey region indicates the constrained range of possible formation locations. H₂O and C evaporation fronts are shown as dashed black lines in all panels. No possible formation regions were identified for WASP-84b in a disc of α = 1 × 10⁻³.