From Spinach Documentation Wiki
Returns diagnostic information about an interaction tensor. Syntax:
tensor - a 3x3 Cartesian interaction tensor matrix
eigvals - eigenvalues of the tensor
dcm - directional cosine matrix for the orientation of the tensor eigenframe relative to the fra- me it's been supplied in.
iso - isotropic part of the tensor
Note: directional cosine matrix is not unique. Although the function makes some effort at consistency, it cannot be guaranteed.