Observed zonal wind velocity profiles (v(l)) and 1σ error envelopes retrieved from our ALMA CH₃CN observations on seven epochs, using a continuously variable parameterization with latitudinal sampling of 30°. These wind profiles are primarily sensitive to zonal winds in the altitude range 200–490 km. L_s values for each observation date are also shown in the legend. Vertical dashed lines indicate latitudes l = −60°, 0°, and 60°; dotted lines indicate l = −45° and −5° to indicate the latitudes plotted in Figure 6.