HCl VMR from our model (red) and minimum retrieved ACS MIR uncertainty (green) at every location where HCl could not be confirmed (i.e. non-detection) during MYs 34 (top) and 35 (bottom). Triangles correspond to observations made at northern latitudes (>45°N), circles at tropical latitudes (45°S-45°N), and squares to southern latitudes (<45°S). Error bars display the standard deviation of modelled HCl within the 5°L_S interval containing the observation.