Table 6.
Fits to stacked and non-stacked data.
| Parameter | Individual | Co-added |
|---|---|---|
| W, Ne IX (mÅ) | 3.3 ± 1.8 | 3.4 ± 1.8 |
| log NNe IX(cm−2) |
 |
 |
| σ | 1.8 | 1.8 |
| c-stat/d.o.f | 11270/10593 | 642/557 |
| W, O VIII (mÅ) |
 |
 |
| log NO VIII(cm−2) |
 |
 |
| σ | 1.9 | 2.1 |
| c-stat/d.o.f | 11269/10593 | 641/557 |
Notes. Comparison between the results of simultaneous fits to the 19 individual RGS1 first-order spectra (column “Individual”), and the results obtained when fitting the co-added spectrum of the same data-set (column “Co-added”). The W denotes the rest-frame equivalent widths of the major transition line of the ion, while the σ marks the nominal detection significance levels for the fitted lines.
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