Evolution of the difference in volume fractions after λ_th normalization defined in Eq. (8). Each line is the volume fraction at z = 0 minus the volume fraction at other redshifts (differentiated with the type of pattern), as a function of λ_th. The colour code, simulation, and R_S value is the same as the one used in Fig. 2. The magenta circle marks the constant volume threshold λ_CV in which the volume fractions of each element become approximately constant over time.