Effect of fixed surface temperature on retrieved atmospheric structure. The three columns correspond to retrievals from the M22-L dataset performed with fixed surface temperatures of 100 K (left), 115 K (middle), and 130 K (right), each assuming an emissivity of 0.8. The panels show the retrieved 3T TPs as a function of pressure. The black curve is the best-fit TP; the gray band marks the 1σ credible interval. The legend for each profile provides the best-fit SO₂ column density, fractional coverage, wind dispersion, and transition pressure (with 1σ errors). Left axes give pressure; right axes show the corresponding altitude. The dashed horizontal black line indicates the modeled surface pressure, quoted with uncertainties calculated from the upper and lower bounds of the SO₂ column density.