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From top to bottom as a cut in x–y plane: OEP ground-state density of ten sodium dimers, difference of electron-photon OEP and electron OEP ground-state density, and sum along the x-axis of the difference between the electron-photon OEP density and the electron OEP density in blue against the electron-photon OEP density in gray. Please note that the latter has been reduced by a factor of 1/2000.
