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(Color online) MC simulations of the layering structure of ionic radial densities of three counterion species with the valences z1 = 1, z2 = 2, and z3 = 3, and numbers of ions in each species N1 = N2 = N3 = 100. The set of radii (R1, R2, R3) are different in the three plots. The corresponding valence-to-volume ratios are: (a) α+1 : α+2 : α+3 = 2.7 : 1.6 : 1; (b) α+1 : α+2 : α+3 = 1.8 : 1.1 : 1; (c) α+1 : α+2 : α+3 = 6.3 : 1.6 : 1.
