Comparisons of the normalised HCl and H₂O VMR abundances observed by the NOMAD spectrometer in MY34–35 (Aoki et al. 2021) and the 77 1D photochemistry model runs with the standard climatolog-ical and MY34 datasets of the MCDv6.1, and MY34 with approximately colocated ACS TIRVIM aerosols and NOMAD/ACS NIR H₂O profiles. Gradients (m) and correlation coefficients (R) for the lines of best fit are as follows. For all model runs, m = 0.82 and R = 0.854. For NOMAD MY34, m = 0.91 and R = 0.92. For NOMAD MY35, m = 0.80 and R = 0.90. This analysis follows Aoki et al. (2021).