/// The ideal single-chain model.
/// The freely-jointed chain (FJC) single-chain model.
/// The extensible freely-jointed chain (EFJC) single-chain model.
/// The square-well freely-jointed chain (SWFJC) single-chain model.
/// The arbitrary link potential freely-jointed chain (uFJC) single-chain model.
/// The worm-like chain (WLC) single-chain model.
static ONE: f64 = 1.0;
static ZERO: f64 = 1e-6;
static POINTS: u128 = 64;