Fig. 1
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Comparison between full set of HFR energy levels calculated using the physical models of the present work (in black) and the HFR energy levels obtained using the physical models considered by Tanaka et al. (2020) (in blue) for Hf I–IV, Os I–IV, and Au I–IV. The red lines correspond to the ionization potentials taken from the NIST database (Kramida et al. 2023).
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