Final Result:
Values with 3 values:
Value 1: (-1.5e-14, 1.3e-15, -1.4e-16)
Value 2: (2, 3.1e-16, -8.5e-17)
Value 3: (4, -6e-16, -8.2e-17)

x1 covariance:
      0.0083      4.3e-19     -1.1e-18
     4.3e-19       0.0094      -0.0031
    -1.1e-18      -0.0031       0.0082
x2 covariance:
      0.0071      2.5e-19     -3.4e-19
     2.5e-19       0.0078      -0.0011
    -3.4e-19      -0.0011       0.0082
x3 covariance:
     0.0083     4.4e-19     1.2e-18
    4.4e-19      0.0094      0.0031
    1.2e-18      0.0031       0.018