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Excess energy, Eexcess, of nanoparticles with respect to the bulk fcc Au as a function of the number, N, of atoms forming the nanoobject. Eexcess is normalised to (a) number of the atoms forming the nanoparticle, and (b) to the number of broken bonds. The dashed lines in (b) show the difference between the actual value of Eexcess as calculated by MM, and a fitted value using Equation (10).
