Temperature derived from 56 VeRa soundings (Table A.1) as a function of latitude at 65,67 , and 75 km in altitude. There is a clear correlation at the lower and higher altitudes and no clear correlation in between. This is also clearly seen in Fig. 9, where the Spearman’s rank and Pearson correlation coefficients are shown as a function of altitude. The lines are the least square linear fits.