Parameters
(1)  x-
(2)  y-
(3)  x+
(4)  y+


(   1) (   2) (   3) (   4) 

1.000  0.032  0.008  -0.010 
0.032  1.000  0.017  0.000  
0.008  0.017  1.000  0.007  
-0.010 0.000  0.007  1.000