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We exploit the density-dependent energy shift of highly excited {Rydberg} states, which is of the order $10$\\MHz\\,/\\,1E14\\,cm$^{\\text{-3}}$ for \\rubidium~for triplet s-wave scattering. The energy shift combined with a density gradient can be used to localize Rydberg atoms in density shells with a spatial resolution less than optical wavelengths, as demonstrated by scanning the excitation laser spatially across the density distribution. 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