"Normal" rauge of variation. 

 A 













 SS 



O 



as 



o 



a 



-J 



K 

 







XT. 



C 

 f> 

 -J 









 n 

 



o 

 z 



o 



> 



a 



z 



D 



K 

 pi 



> 

 z 





 o 



M 

 to 



U 







n 



3 

 z 



