1 Exponential rising tension (ERT)
2 f = E0 / alpha ( e^(alpha x) - 1 )
3 Enhanced WLC (with stretching)
4 f = kB T/p { 1/4 [1/(1-x/L-f/K)² - 1] + x/L - f/K }
5 Enhanced FJC (with stretching)
6 x/L = [coth(Lk f/ kB T)- kB T/Lk f](1+f/K)
7 from Leuba & Zlatanova. Biology at the Single-Molecule Level. p13