Fig. 5From: Mean winds at the cloud top of Venus obtained from two-wavelength UV imaging by AkatsukiZonal (a, c) and meridional (b, d) winds obtained by tracking 365-nm (a, b) and 283-nm (c, d) radiance obtained on December 7, 2015. Stipples show where the estimated precision measure ε u (ε v ) is smaller than 4 m/s for zonal (meridional) winds. The winds are defined at the centers of the template regions defined in the initial radiance field observed at 17 hBack to article page