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Fig. 5
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Comparison between HFR oscillator strengths (log gf) and previously published values for Nb I–IV ions. Previous data were taken from Gao et al. (2019) for Nb I, from Nilsson et al. (2010; Nil) and Ruczkowski et al. (2015; Ruc) for Nb II, from Nilsson et al. (2010) for Nb III and from Kramida et al. (2023) for Nb IV.
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