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Relationships between the (a) χzzz/χyyz or (b) χzzz/χyzy ratio and θ for an α-helix in terms of different Gaussian distribution widths σ. Black: σ = 0, blue: σ = 5°, red: σ = 10°, green: σ =20°, and pink: σ = 30°. When σ is zero, the distribution is a delta-distribution.
