Table 5: The fractional level populations Nj, calculated at different electron densities (cm-3) and the temperature T= 12.6 MK (log T=7.1) for the lowest (most populated) levels.

i
Level 108 1014 1019

1
2s2 1S $_{0}^{\rm e}$ 0.98660 0.90391 0.16307
2 2s 2p 3P $_{0}^{\rm o}$ 0.01340 0.02357 0.07512
3 2s 2p 3P $_{1}^{\rm o}$ 1.5 $\times$ 10-10 1.3 $\times$ 10-4 0.20997
4 2s 2p 3P $_{2}^{\rm o}$ 3.2 $\times$ 10-7 0.07239 0.28535
5 2s 2p 1P $_{1}^{\rm o}$ 4.8 $\times$ 10-12 4.5 $\times$ 10-6 0.07012
6 2p2 3P $_{0}^{\rm e}$ 7.7 $\times$ 10-15 8.0 $\times$ 10-9 0.01898
7 2p2 3P $_{1}^{\rm e}$ 5.1 $\times$ 10-14 1.4 $\times$ 10-7 0.04677
8 2p2 3P $_{2}^{\rm e}$ 2.3 $\times$ 10-14 1.7 $\times$ 10-7 0.07200
9 2p2 1D $_{2}^{\rm e}$ 4.0 $\times$ 10-14 1.1 $\times$ 10-7 0.05170
10 2p2 1S $_{0}^{\rm e}$ 9.0 $\times$ 10-15 8.7 $\times$ 10-9 4.9 $\times$ 10-3


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