l'wo eontrol points in indicated 
  
  
  
  
  
N 
$ 
A go 
O0 53 
EIL 2 
0 Q 
8 9° + 
> = 
> — 
- = È oF 
< 70 2 = 
= © 
Ee o uv 
S S 
m 9 Nol vo] «xl oj «ll -l o — 
rs 2.8 Nl] of NNN S| 2 = = 
Qua z E 
É nf 2 * 
MO 
RA = 
fi n 
T v5 = 
E SS E 
gv _ 
82 s 
0 z 
2 
; f 
| | of =| of © + ; 
(NS pg 
Ss 
  
Diagram 4. 
-H 
—