228 
CONCLUSION 
The purpi 
and localisa 
saharian Atl; 
In fact 
signatures ce 
us to stand 
improvement < 
to 192 spect 
quantitative 
between the < 
a caracterizi 
samples are 
all the regie 
AKNOWLEDGEI 
The spei 
been carried 
grateful for 
SIMONIN, J.P. 
REFERENCES 
ESCADAFAL R. 
observations 
RICHARDS A.J. 
BILDGEN P.,Mi 
données spe< 
éxo-atmosphéi 
d'exploitatic 
de Bondy (4-6 
BILDGEN P.,i 
bauxitiques i 
des données r 
France. 
figure 7