Same as in Fig. 5 with IHUA models matching the observations up to 800 km in altitude. At the lowest altitude, the temperature is found to be ~340 K (solid line). At altitude above ~200 km, we identified layers with different temperatures at about 550 K (dashed line), 910 K (dotted line), then back to 550 K (dashed line). A few error bars are indicated to underline that, in the lower altitude region [III] from 0 to 800 km above the reference level, the observations are on the average incompatible with an IHUA model slope corresponding to ~900 K, the sodium condensation temperature, demonstrating that condensation has to take place in the planetary atmosphere.