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Table 2
Predicted column densities for the sum of both components.
| Atom | Lower | Preferred | Upper | |
| or ion | extreme | value | extreme | |
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| Local densities and shielding of radiation | ||||
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| n(Htot)(cm-3) | 0.17 | 0.30 | 0.40 | |
| n(H0)(cm-3) | 0.10 | 0.20 | 0.28 | |
| n(H+)(cm-3) | 0.07 | 0.10 | 0.12 | |
| n(He0)(cm-3) | 7.2(−3) | 0.016 | 0.023 | |
| n(He+)(cm-3) | 9.3(−3) | 0.014 | 0.017 | |
| n(He++)(cm-3) | 5.2(−4) | 5.3(−4) | 5.2(−4) | |
| n(e)(cm-3) | 0.08 | 0.11 | 0.135 | |
| Shielding | ||||
| N(H0)(cm-2) | 4.25(17) | 4.00(17) | 3.50(17) | |
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| Expected column densitiesa | Observed | |||
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| Upper N(H0) | 2.4(18) | 2.7(18) | 2.8(18) | |
| Best N(H0) | 1.7(18) | 1.9(18) | 2.0(18) | |
| Lower N(H0) | 1.3(18) | 1.4(18) | 1.5(18) | |
| Upper N(C+) | 7.7(14) | 7.8(14) | 7.9(14) | 8.1(14) |
| Best N(C+) | 5.2(14) | 5.3(14) | 5.3(14) | 6.7(14) |
| Lower N(C+) | 3.7(14) | 3.8(14) | 3.8(14) | 5.9(14) |
| Upper N(O0) | 1.0(15) | 1.2(15) | 1.2(15) | 1.3(15) |
| Best N(O0) | 7.2(14) | 8.2(14) | 8.4(14) | 1.15(15) |
| Lower N(O0) | 5.3(14) | 6.0(14) | 6.2(14) | 1.02(15) |
| Upper N(Mg+) | 1.4(13) | 1.6(13) | 1.7(13) | 6.7(12) |
| Best N(Mg+) | 9.8(12) | 1.1(13) | 1.2(13) | 6.5(12) |
| Lower N(Mg+) | 7.4(12) | 8.4(12) | 8.9(12) | 6.3(12) |
| Upper N(Si+) | 2.0(13) | 2.0(13) | 2.0(13) | 1.36(13) |
| Best N(Si+) | 1.4(13) | 1.4(13) | 1.4(13) | 1.30(13) |
| Lower N(Si+) | 1.1(13) | 1.1(13) | 1.1(13) | 1.24(13) |
| Upper N(S+) | 8.0(13) | 8.3(13) | 8.4(13) | 2.68(13) |
| Best N(S+) | 4.5(13) | 4.6(13) | 4.7(13) | 2.44(13) |
| Lower N(S+) | 2.6(13) | 2.7(13) | 2.8(13) | 2.20(13) |
| Upper N(Ar0) | 2.0(12) | 2.7(12) | 3.0(12) | 1.93(12) |
| Best N(Ar0) | 1.3(12) | 1.8(12) | 2.0(12) | 1.86(12) |
| Lower N(Ar0) | 9.2(11) | 1.2(12) | 1.4(12) | 1.79(12) |
| Upper N(Fe+) | 2.6(12) | 2.6(12) | 2.6(12) | 2.48(12) |
| Best N(Fe+) | 1.9(12) | 1.9(12) | 1.9(12) | 2.45(12) |
| Lower N(Fe+) | 1.4(12) | 1.4(12) | 1.4(12) | 2.42(12) |
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