9 



8 



7 



6 











^-f-r 



=i=^iz 





























^ 









































I 







T 



















5 









... 





— 



■ 1 





































































































































































































































































































4 



3 























































































































EE 





































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































.... 



























































































































































































































































































































































































































































































































































































































































































































































































































100 



9 



8 



7 



6 



























1 















: 

































































































5 

































































































































































































































































































































































































3 







































































































































J^ 









































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































1 









































































































































\ 









































































































































\ 









































































































































1 



































































































































































































































































1Q_ 



9_ 

 8_ 

 7_ 

 6_ 





















I 











- 



| 













_ 



= 



z 







_ 





_ 







































































































































































































































































































































































































































































































4_ 

 3_ 

































































































































































































































































































































































































































































































































































2 















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































1 







































































































































d/ L 



FIGURE 4. f(d/L) VERSUS d/L 



