The orthogonal functions :    
 
 phi0(x) =    
 
    1.  
 
 phi1(x) =    
 
  - 0.5 + x   
 
 K(2,0) =    
 
  - 0.33333  
 
 K(2,1) =    
 
  - 1.  
 
 phi2(x) =    
 
                   2  
    0.16667 - x + x   
 
 K(3,0) =    
 
  - 0.25  
 
 K(3,1) =    
 
  - 0.9  
 
 K(3,2) =    
 
  - 1.5  
 
 phi3(x) =    
 
                      2   3  
  - 0.05 + 0.6x - 1.5x + x