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Experimental (dots) and theoretical (lines) population abundance for (A) single Au sphere90 nm, (B) heterodimers Au sphere90 nm–Pd cube25 nm, and (C) multimers Au sphere90 nm–Pd cube25 nm; as a function of the average number of Pd cube25 nm in the effective volume of action of Au sphere90 nm (⟨B⟩ = [B]va).
