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The weight (= charge density) of the highest occupied molecular orbital (HOMO) and lowest unoccupied one (LUMO) on the different sites of a 91-dot array (computed for a closely packed and somewhat expanded lattice). The weight is plotted on a logarithmic scale so as to show that when the dot–dot coupling is no longer sufficient to overcome the effects of disorder, the localized molecular orbitals decrease exponentially with distance from their center.
