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Relationship between the χzzz/ χyyz ratio and θ for α-helices with different chain lengths: (a) blue: 10, green: 12, red: 13, cyan: 15, purple: 16, yellow: 17, black: 18 residues; (b) blue: 28, green: 30, red: 31, cyan: 33, purple: 33, and yellow: 35 residues.
