New recordings of the Nb II spectrum have been analyzed in the region 1500–4900 Å. 2025 lines have been classified, and all but three of the previously known 67 even and 136 odd levels have been confirmed. New levels have been established, 117 even and 36 odd, giving a total of 353 known Nb II levels.
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Ryabtsev et al. (2000) studied this question.
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