Table 2
X-ray spectral quality classes defined based on the XMM pointing quality and the signal-to-noise ratio (S/N) of the spectrum.
| Quality class | N | F X amin /F fit | Flag | PN counts | MOS1 counts | MOS2 counts | |||||||||
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| Pointing | S/N | med | mean | σ | min | max | med | min | max | med | min | max | med | ||
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| 0 | >6 | 547 | 1.00 | 1.0 | 0.3 | 1 | 25 | 11194 | 268 | 13 | 2626 | 105 | 6 | 2651 | 107 |
| 0/1/2 | >4 | 281 | 1.01 | 1.1 | 0.5 | 2 | 8 | 1879 | 103 | 3 | 244 | 43 | 6 | 415 | 40 |
| 0/1/2 | 3−4 | 75 | 1.07 | 2 | 3 | 3 | 6 | 246 | 43 | 2 | 49 | 23 | 4 | 81 | 20 |
| 0/1/2 | <3 | 96 | 0.78 | 52 | 191 | 4 | 3 | 177 | 16 | 1 | 34 | 6 | 1 | 55 | 5 |
| NoData | – | 1 | – | – | – | 5 | – | – | – | 2 | 2 | – | 1 | 1 | – |
Notes. The XMM pointing quality classes are: 0 = good quality (> 7 ks exposure time and < 1.5 × 10-5cts s-1cm-2 background level, 1 = low exposure time (> 3 ks), 2 = high background < 4.5 × 10-5cts s-1cm-2). Pointings with quality class 3 corresponding to both low exposure time and high background were not used for spectrum extraction.
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