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Table 2
Spectral classification of the X-ray source sample.
| Spectrum | Classified | Selection criteria |
|
|
||
| Super soft | 18 | (8HR1 + 3HR2 < −3 or (HR1 < −0.75 && HR2 not def.)) |
| && F1 > 3ΔF1 && F3 < 3ΔF3 && F4 < 3ΔF4&& F5 < 3ΔF5 | ||
| Soft | 298 | 8HR2 + 3HR3 < −3 or (HR2 < −0.75 && HR3 not def.) |
| Hard | 2711 | (8HR2 + 3HR3 > −3 or (HR2 > 0&&HR3 not def.)) && not super soft |
| Ultra hard | 945 | 8HR3 + 3HR4 > −1.4 or (HR3 > 0.2&&HR4 not def.) && not soft && not super soft |
| Unclass. | 8 | − |
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