| X1 | X2 | X3 | X4 |
X1 | 1.000 | 0.837 | 0.885 | 0.932 |
X2 | 0.837 | 1.000 | 0.989 | 0.945 |
X3 | 0.885 | −0.935 | 1.000 | 0.956 |
X4 | 0.932 | 0.945 | 0.956 | 1.000 |