Global association quotient, Kc, as a function of the logarithm of the ligand concentration log(L/mM) for the scheme depicted in Fig. 2d and (23) and its structural decomposition into the two partial association quotients, Kc,i(L). In the inset, we show the fractions of free sites, ωi(L), related with each subsystem associated to each partial association quotient. The parameter values used are the same as Fig. 3