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We have elected to use the Paschen notation for the energy levels, because we believe this makes comparison with other work easier. The pair-coupling notation may be found in Ref. 7.
In one or two cases there was some uncertainty as to which LS-coupling level should be correlated with a given observed level. We adopted the guide that the LS-coupling level was the one which referred to the same diagonal-element position in the initial LS-coupling energy matrix that the calculated energy had in the final diagonal energy matrix.
Ref. 6, p. 311.
Formula (4) in Ref. 2 is correct as far as it goes, but it must be summed over the polarization index q, and hence multiplied by a factor 3, to give absolute line strengths. The same factor 3 must be applied to formulas (2.1) and (2.1a) of Ref. 3. Table IV of Ref. 3 is erroneous, and all entries in it must be multiplied by 4π/3, as must formula (2.2) of the same reference. See footnote 19 of Ref. 4 for further details.
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