(Gl) 



s + -t;lHti^lflffi 



¥ 



5/ 7 



7 ^ 



It 



4» 6 n 



ft 75 * 



111 



* K * 



^ M fi - 



-7 



fe 7> M * 



* & ft 



» m 





* K 



* ? 



> ft 



? a 



7 >* 



^ tit 



* 3n 



i- ? 



y \/ 



» 

 * 



A 



3 



A' 



A 



1/ 



o 



% m 



T % 



fit ^ % 



rfi) s 



7 



ft 



7 



/r a 

 ft/ > 



7 



•7 



O 



m 



m 



± 



•r 



A 



— i 



A 



ft 



7 =- 



is r 

 y 



m 

 ^>» 



Rf 



ft 

 ■» 



ft 

 •t 



a 



7 



- K 



m m 

 m ' 



# H 

 m tt 



M ° 7 



ft 



i/ 

 •* 



7 



T3 



it 



_ i 



7 



V 

 if 



Fig. 5. 



ft 





7fi ' 



* % 



T 





i a ^ 

 ft us 



a 



.-*"% 



EL ? 





9 



v 



^ 



7 





7 i 



- A 



7 7 



^> x ) 



& o i 



$ P3 ^ 7 



- & B9 * 



^ # tf ^fe 



V ^ ± ffi 



in ^ s / m 



- m m m m 



3 § ^ SS ft 



? 1 * * a 



& ~ ft 



^ 3 ^ 



7 A fi^J 



m ix Jx 



v B B 



* = b 



5/ 1/ 



m 9 



-a © 

 ft » 



7 ^ 



* 



^ 





i 



PFJ 



Q 



03 



o 



as 



7 



7 



ft 





7 3 



I V 



* IB 



° m 



A 



"" 1 



•o 



ft 

 7 



7 4" 



a ^ 



n — 



b i£ 



•/ 



m 



