Contribution and wind contribution functions. A: contribution functions of the HCN and CO lines at Jupiter’s limb at the spectral and spatial resolutions of the observations. They are computed for different frequency offsets from the line center. For HCN, different locations (low-to-mid latitudes and polar regions) are presented. For CO, the contribution functions are similar regardless of the latitude. B: wind contribution functions for HCN at low-to-mid (solid blue line) and polar latitudes (dotted black line) and for CO at any latitude (dashed red line).