with K ¼20, lmax¼ 1, l0¼ 0.7, lmin¼ 0.4 – Fig.1. Thus the equilibrium
bond length between the nearest neighbor monomers is l0 ¼ 0.7.
Here and in what follows we use the maximal extension of the
bonds, lmax¼1, as our unit length while the potential strength is
measured in units of thermal energy kBT where kB is the Boltzmann
constant.