Given a protein map contact map (which for this particular case is a matrix of all Ca-Ca atoms in protein 1a3a that are less than 8 Angstroms):

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Question: For each contact, is there an established heuristic to determine what kind (alpha, beta, or tertiary) of contact this is?

Observations: The contacts along the diagonal +4 clearly belong to alpha-helices, but I'm struggling to find a way to identify the parallel and anti-parallel beta-sheets and to differentiate these from a long range tertiary contact.

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