| Y | X1 | X2 | X3 | X4 | |
| Y | 1.00E+00 | ||||
| X1 | −2.49E-01 | 1.00E+00 | |||
| X2 | −1.25E-01 | 1.37E-17 | 1.00E+00 | ||
| X3 | 2.84E-01 | 8.63E-03 | 1.63E-17 | 1.00E+00 | |
| X4 | −7.71E-01 | −1.73E-01 | −1.61E-17 | 2.16E-01 | 1.00E+00 |