Figure 4: Comparison of retrieved "stratospheric" optical thickness Figure 5: same as figure 4 but for the wavelength 
with measurements performed at Mauna Loa observatory. exponent 
Figure 6: Latitudinal "stratospheric" profile observed 
after ML Pinatubo eruption. 
Latitude [Deg] 
Figure 7a: comparison between "exact" computation 
and Eq. (3) approximation for transmission function at 
630nm