Maximum HCl VMR from our model (red) and ACS MIR (green) at every location where HCl was retrieved by the instrument during MY 34 (top) and MY 35 (bottom). Model maxima are extracted from the altitude range over which HCl is observed by ACS MIR. 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 and the uncertainty on the ACS value.