Comparison between the mole fractions of four species calculated using our code (solid lines with 1σ std) and the one calculated using the Titan PCM model (shaded lines) from 0 to 147 km. The error bars in the PCM modeled profiles denote the range of values between L_s 300°-360°. The vertical profiles of HCN, C₂H₂, and C₂H₆ from Titan PCM show a decrease in mole fractions after condensation near the tropopause, while C₂H₄ does not condense in Titan conditions. Mole fractions computed using CIRS data have also been plotted at 150 km (solid lines with circular markers, 1σ std) (Mathé et al. 2020). We took results from flyby T18 for this comparison because it was conducted near the Huygens probe landing site.