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As anticipated by Farley and Wing [Phys. Rev. A {\\bf 23}, 2397 (1981)], retardation needs to be taken into account in calculations of this energy shift at and above the temperature $\\alpha\\, mc^2/(3k_{\\rm B}\\,n^2)$, where $n$ is the principal quantum number of the state considered, $m$ is the mass of the electron and $k_{\\rm B}$ is Boltzmann constant.The corresponding non-dip","authors_text":"R. M. 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