The radius of gyration of an uncharged polymer chain (ξ = 0.00) at ε mer ≃ 0.4 k B T almost exactly corresponds to the radius of gyration of the ideal, non-interacting polymer chain R id g . The radius of gyration increases with the charge fraction of the polymer and the transition is shifted to higher ε mer values. However, a small concentration of salt (0.1 m) already suppresses this trend due to the charge screening, as shown in Figure . Thus we choose ε mer = 0.4 k B T to describe the solvent quality for uncharged and charged polymers close to the critical conditions, with the exception of strongly charged (ξ = 0.10) anionic polymer where the value ε mer = 0.5 k B T is used instead. Note that the critical value of ε mer depends on the actual chain size and the charge fraction. The value approaches 0.3 k B T for an infinitely long uncharged chain.