' 1,2 = 255 * (2/21 - 1/16) = +8  
  Z '' 1,2 = 80 * (1/21 - 2/16) = -6 
   Z '' ' 1,2 = 145 * (1/16 - 1/21) = -2 
 2 
 16 
 1,2 
 2 
 3,2 
 Z ' 2,3 = 255 * (1/16 - 2/21) = -8 
   Z '' 2,3 = 80 * (2/16 - 1/21) = +6 
   Z '' ' 2,3 = 145 * (1/16 - 1/21) = +2 
 3 
 21 
 1,56 
 2 
 4,5 
 Z ' 3,4 = 255 * (2/21 - 1/20) = +12 
   Z '' 3,4 = 225 * (2/21 - 2/20) = -12 
 4 
 20 
				
				
				
				
			
 1,5 
 2 
 6,5 
 Z ' 4,5 = 255 * (1/20 - 1/13, 7) = +6 
   Z '' 4,5 = 225 * (2/20 - 1/13, 7) = -6 
 5 
 13,7 
 1 
 1 
 7 
 Z ' 5,6 = 175 * (1/13, 7 - 1/5) = -22 
   Z '' 5,6 = 305 * (1/13, 7 - 0) = +22 
 
 6 
 5 
 0,4 ​​
 1 
 8 
 Z ' 6,7 = 175 * (1/5 - 0) = +35 
   Z '' 6,7 = 225 * (0 - 1/6, 4) = -35 
 
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