Fig. 2.

The ZB helix propagation-parameter, s(T), for Ac-Ala₁₅-NMe plotted against: θ (a), 〈k〉/〈j〉 (b), and 〈j〉 (c). The solid thin lines are from Eqs. 6 (a), 7 (b), and 5 (c) with fixed σ of 0.001, 0.01, 0.1, 0.5, and 1.0. The thin red lines are obtained in the same way, except when using the large-n approximation instead (equations not shown here). The thick lines with filled circles are from our simulations.