Table 6: Level populations of the most spectroscopically-important levels (in decreasing order of level population), calculated at 1010 cm-3 and T=1 MK. The first two columns list the values Nj [cm-3] calculated with the present ion model, including all excitations between all the 54 levels (case A), and only excitations from the first three levels (case B, see also Fig. 2). The last two columns report, for comparison, the values calculated by Bhatia & Doschek (1995) [BD] and Pelan & Berrington (2001) [PB] at a density of 1010 cm-3. The metastable levels are marked M.

i		 A B BD PB  

1		 0.67 0.46 0.72 0.62  
2 0.19 0.13 0.14 0.17 M
8 $3.9 \times 10^{-2}$ 0.19 $4.2 \times 10^{-2}$ $8.7 \times 10^{-2}$ M
5 $3.1\times 10^{-2}$ 0.10 $2.9 \times 10^{-2}$ $4.1\times 10^{-2}$ M
10 $1.9 \times 10^{-2}$ $6.8 \times 10^{-2}$ $1.9 \times 10^{-2}$ $3.7 \times 10^{-2}$ M
18 $1.7\times 10^{-2}$ $2.1\times 10^{-2}$ $2.0 \times 10^{-2}$ $1.6 \times 10^{-2}$ M
20 $1.4 \times 10^{-2}$ $1.4 \times 10^{-2}$ $1.3\times 10^{-2}$ $1.3\times 10^{-2}$ M
21 $1.2\times 10^{-2}$ $1.3\times 10^{-2}$ $1.3\times 10^{-2}$ $1.1 \times 10^{-2}$ M
24 $5.2 \times 10^{-3}$ $3.8 \times 10^{-3}$ $4.8 \times 10^{-3}$ $3.9 \times 10^{-3}$ M
4 $5.7 \times 10^{-7}$ $2.6 \times 10^{-7}$ $1.5 \times 10^{-7}$ $3.7 \times 10^{-7}$  
6 $1.4 \times 10^{-7}$ $7.0 \times 10^{-8}$ $ 1. \times 10^{-7}$ $1.2 \times 10^{-7}$  
22 $8.3 \times 10^{-8}$ $4.3 \times 10^{-8}$ $5.7 \times 10^{-8}$ $4.5\times 10^{-7}$  
19 $3.4 \times 10^{-8}$ $1.6 \times 10^{-8}$ $5.4 \times 10^{-9}$ $1.3 \times 10^{-8}$  
17 $1.4 \times 10^{-8}$ $6.1 \times 10^{-9}$ $1.2\times 10^{-8}$ $1.3 \times 10^{-8}$  
15 $3.5 \times 10^{-9}$ $1.9 \times 10^{-9}$ $2.3 \times10^{-9}$ $2.2 \times 10^{-9}$  
13 $2.9 \times 10^{-9}$ $1.7 \times 10^{-9}$ $1.7 \times 10^{-9}$ $6.3 \times 10^{-9}$  

3

 $1.5 \times 10^{-9}$ $1.0 \times 10^{-9}$ $1.9 \times 10^{-9}$ $1.4 \times 10^{-9}$  
43 $7.3 \times 10^{-10}$ $4.7 \times10^{-10}$      
44 $3.6 \times 10^{-10}$ $2.4 \times 10^{-10}$      
30 $2.5 \times 10^{-10}$ $1.7 \times10^{-10}$ $2.2\times 10^{-10}$ $2.1 \times 10^{-10}$  
28 $1.7 \times10^{-10}$ $1.2 \times10^{-10}$ $1.7 \times10^{-10}$ $3.2 \times 10^{-12}$?  
45 $1.3 \times 10^{-10}$ $8.6 \times10^{-11}$      
31 $9.9 \times 10^{-11}$ $6.7 \times10^{-11}$ $6.3\times 10^{-11}$ $7.5 \times 10^{-11}$  

27

 $9.5 \times 10^{-11}$ $6.5 \times10^{-11}$ $ 8.4 \times 10^{-11}$ $7.8 \times 10^{-11}$  
29 $6.0 \times 10^{-11}$ $4.1 \times10^{-11}$ $3.9 \times 10^{-11}$ $4.9 \times 10^{-11}$  


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