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Table 3:

Magnetic dipole hyperfine structure constants A in MHz for the levels of odd parity of Nb  I.

Notes. Level energies according to Humphreys & Meggers (1945); configurations and terms according to Kröger et al. (2007). The wavelength in air  $\lambda_{\rm air}$given in the fourth column specifies the line, that was used to determine the hyperfine constant  $A_{\rm fit}$; $A_{\rm fit}$ is the average result from eight measurements; $\Delta A_{\rm
fit}$ is the corresponding standard deviation. If more than one line was available for a level to determine  $A_{\rm fit}$, the weighted mean value  $A_{\rm mean}$is calculated, using  $\Delta A_{\rm
fit}$as weight. In column  $A_{\rm mean}$the standard deviation, that resulted from the weighted mean value calculation is given as error. If known, reference values  $A_{\rm ref}$from the literature are listed together with the indication of the method used. If more than one reference value has been published for a given level, only the most precise one is given.
(a) Optogalvanic spectroscopy; (b) saturation absorption spectroscopy; (c) laser induced fluorescence spectroscopy; (d) laser radio-frequency double resonance.
(*) FWHM and ratio between Gaussian and Lorentzian FWHM fixed during the fit; ($^{\dag }$) error in sign in Basar et al. (2008); ($^{\ddag }$) $\Delta A_{\rm
fit}$is set equal to the uncertainty of the Al-constant of the lower level.

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