Provided a given topology, i.e. fixed N ch and N cross , we simulate microgels with various chain lengths N and different system parameters, which include microgel concentration, reservoir pH and salt concentration. The simulations are initialized with a fully stretched configuration of the microgels, as depicted in Fig. , and are then evolved until equilibration, as shown for a representative case in Fig. . Once equilibrated, we periodically extract observables including the microgel radius of gyration and degree of ionization from the simulations. For quantities such as the net charge, the equilibrium microgel radius is needed, which is obtained from the measured polymer density profile as described somewhere else. 6