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The Elemental Data Index provides access to the holdings of NIST Physics Laboratory online data organized by element. It is intended to simplify the process of retrieving online scientific data for a specific element. Data accessible through this index include: atomic spectroscopic data, electron-impact ionization cross sections, x-ray and gamma ray absorption data, radiation dosimetry data, radionuclide half-life measurements, isotopic compositions and atomic weights, and atomic reference data for electronic structure calculations.