Figure 1.

(A) Schematic describing the angular coordinate. λ is defined as a function of the angular θ coordinate, λ = r cos(θ) + (1/2), with the radius of the circle being defined as r = (1/2) + σ, and σ a fluctuation size (see main text). The segments of circumference corresponding to the intervals a and b close to the end and center of the λ interval, respectively, are indicated. (B) Entropic free-energy term introduced by the use of an angular coordinate θ.