° | 
C 
* 
: á 
] and 2 
c = Vnhi;p * Bp, as shown in Figure 6. (The subscript i refers to the subscripts 
in Figure 6). 
  
  
  
  
  
a! b' 
a b à 
^n n 
C 
d! m 
c! 
Fig. 4