Table 2.
Significance of detected variable features.
| Energy | Δχ2σsingle (1) | MC σsingle (2) | σgroup (3) | |||
|---|---|---|---|---|---|---|
| Low | Mid | High | ||||
| keV | % | % | % | % | % | |
| Unobscured | ||||||
| Emission | ||||||
| 4–6 | 91 | 94 | 92 | 92 | 99.3 | A |
| 6–8 | 91 | 94 | 93 | 93 | > 99.9 | B |
| 8–10 | 91 | 92 | 90 | 91 | 91.0 | |
| Absorption | ||||||
| 4–6 | 92 | 90 | 91 | 88 | 87.0 | |
| 6–8 | 91 | 90 | 88 | 89 | 99.9 | C |
| 8–10 | 90 | 87 | 83 | 80 | 91.0 | |
| Obscured | ||||||
| Emission | ||||||
| 4–6 | 95 | 97 | 96 | 96 | > 99.9 | D |
| 6–8 | 96 | 99 | 99 | 98 | 99.0 | |
| 8–10 | 94 | 96 | 96 | 95 | 65.0 | |
| Absorption | ||||||
| 4–6 | 97 | 97 | 96 | 97 | 93.0 | |
| 6–8 | 92 | 91 | 93 | 92 | > 99.9 | E |
| 8–10 | 96 | 96 | 95 | 95 | 74.0 | |
Notes. (1) Significance of single features calculated from the Δχ2 for 3 Δd.o.f. measured after the addition of a Gaussian line in emission or absorption; (2) significance of single features from MonteCarlo simulations (Low/Mid/High refer to the different selected flux levels, defined in Sect. 3.4); (3) global significance of detected features (i.e. calculated from a binomial distribution, and assuming the total number of spectra in each state as the number of trials, the number of detections obtained via the blind search as the number of successes, and the mean value from MC simulations as the success probability for each trial). The letters A–E refer to the groups of features with a significance > 3σ, as indicated in Sect. 3.4 and displayed in Fig. 5. Their nature is discussed in Sect. 5.
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