Vertical profiles of HCl VMRs (left), water vapour VMRs (middle), and water ice and dust opacities (right) computed with our model (solid lines) and compared to observations. Model profiles are averaged over the 5° L_S interval containing the ACS observation. The standard deviation represents the variability of the computed profiles within this interval. The plots correspond to the ACS MIR occultation 003814_N2_E_P1_12_F, located at latitude 54.05°S, longitude 136.46°W, 260.55° L_S,LT=20.64hrsinMY34.