Units of MIL, tensor M and eigenvectors

Hello. Does anyone know what are the units for MIL, tensor M and eigenvectors? Are they normalized? and if they are normalized what base is used for normalization. Thank you.

Mean intercept length (MIL) is in length units of your input image (e.g. mm, µm)
Eigenvectors are unitless (normalised to 3 unit vectors)
Eigenvalues are length units ⁻² (e.g. mm⁻² or µm⁻²) (because radius of the MIL cloud = 1/sqrt(eigenvalue)), but I’m not sure how much value there is in knowing the units of the eigenvalues.

P.S. please don’t double post the same question.