Dear all,

I need to calculate a crossing angle between two alpha-helixes. I have found a method developed by Chothia, Levitt and Richarddson (J. Mol. Biol. 1981, 145, 215-250) but it requires calculation of helix axis direction using eigenvector of inertia matrix etc. Are there another easier method to calculate the principal axis of helix or crossing angle between helices?

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