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The radial density distributions of the carboxyl groups and the sodium counterions around (a) Au18(SR)60, (b) Au102(SR)44 and (c) Au144(SR)60. The snapshots on the top show the density maps of sodium around the NP (the coloring scheme in order of increasing density is: blue, green, red). The snapshots at the bottom show the sodium lying within 3.5 Å of both NPs simultaneously at the bound state.
