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


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

1.000  -0.035 -0.001 -0.004 
-0.035 1.000  -0.002 -0.006 
-0.001 -0.002 1.000  -0.271 
-0.004 -0.006 -0.271 1.000