| x1 | x2 | x3 | x4 |
e11 | −1 | −0.58 | 0.58 | 1 |
e12 | −0.58 | 0.58 | 1 | −1 |
e13 | 0.58 | 1 | −1 | −0.58 |
e14 | 1 | −1 | −0.58 | 0.58 |
e31 | −1 | 0.58 | 1 | −0.58 |
e32 | 0.58 | 1 | −0.58 | −1 |
e33 | 1 | −0.58 | −1 | 0.58 |
e34 | −0.58 | −1 | 0.58 | 1 |
cc | 0 | 0 | 0 | 0 |