Table 6.
Oxygen line fit parameters.
| 2005 | 2015 | |
|---|---|---|
| O VII Er | 573.81 ± 0.11 eV | 573.77 ± 0.06 eV |
| O VII σ | 1.1 ± 0.1 eV | 0.54 ± 0.10 eV |
| Flux r | 2.64 ± 0.18 | 3.45 ± 0.18 |
| Flux i | 1.81 ± 0.16 ± 0.13 | 2.29 ± 0.16 ± 0.14 |
| Flux f | 0.28 ± 0.12 ± 0.03 | 0.35 ± 0.10 ± 0.01 |
| O VIII E | 653.16 ± 0.15 eV | 653.09 ± 0.13 eV |
| O VIII σ | 1.0 ± 0.2 eV | 1.1 ± 0.2 eV |
| O VIII flux | 1.61 ± 0.10 | 2.16 ± 0.11 |
| G = (f + i)/r | 0.79 ± 0.17 | 0.76 ± 0.12 |
| R = f/i | 0.15 ± 0.08 | 0.15 ± 0.05 |
| H/He ratio | 0.34 ± 0.05 | 0.35 ± 0.04 |
Notes. Labels r, i, and f refer to the resonance, intercombination, and forbidden lines of O VII, respectively. Line fluxes are given in units of 10−13 erg cm−2 s−1. The first error term for the i and f lines indicates statistical, the second a systematic error which takes the excess photons between the lines into account. The last row gives the line ratio between the two species.
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