| Y | X1 | X2 | X3 | X4 | |
| Y | 1.00E+00 | ||||
| X1 | −8.86E-02 | 1.00E+00 | |||
| X2 | 1.20E-01 | −9.68E-17 | 1.00E+00 | ||
| X3 | 9.44E-01 | −7.11E-16 | −5.07E-17 | 1.00E+00 | |
| X4 | −2.78E-01 | −3.33E-18 | 2.22E-18 | −7.97E-03 | 1.00E+00 |