PORTSALL 23-3-78 



AW 31-3-78 



FPD 



i-jji 



if 



T 



; 1_ 



.1 



a~^ 



M 



v # 



^J 



AW 22-11- 78 



4 



AW 20 6 -79 



M 



V 



"if 



i 



FPD 



,P 





,/Vl 



AW 17-1-80 



A'*" 



'-OJ 



V. 



M, 



\i 



AW 24-6-80 



_> 



STATION 5 



FIGURE 11. Evolution of aromatic hydrocarbons. 



122 



