13
180° equals π radians.
14
This may occur while selecting amide hydrogens in amino acids, given that proline
residues have none.
15
More formally a matrix of eigenvectors of rMat multiplied by its transpose; an array of
single numbers, each of which is the square root of the corresponding eigenvalues; another
matrix of eigenvectors for the transpose of rMat multiplied by rMat. If you want to know
more details about what is going on, see the following reference: Kabsch, W. (1978). A
discussion of the solution for the best rotation to relate two sets of vectors. Acta
Crystallographica 34A: 827–828.
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