111 &— 2116 116° gor 111 
— 
105^ M 73 101 
AC 
7 
= 91 
  
  
  
  
  
  
d: 
Nn 
I-D1— X 
y 51 
# i ; 41 
AM | 31 
EE ] 
1B | 
il 21 
i 
LI 11 
OÙ | 
V a) b) v 
y y 
Fig 3 
Point arrangement. Base in/out. Projection plane. 
a) Left projector,base in = right projector, base out 
b) ^" " ” mutus 1" " s riii