Radial distribution of the electron density (A), the equipartition magnetic field (B), and the product of the two with (D) and without (C) redshift dilution, for M_clust = 10¹⁵ M_⊙ and ɀ_max = 4. Each value at a given radius is the skew-normal median of the values of all N_tree = 10³ MTs. We can see that the n_e profiles decrease more than that of B_equ. Without redshift dilution, we would expect n_e to play a major role in the RM decay. However, because of the (1 + ɀ)⁻² factor, RM curves evolve very little over time.