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Table 1.
Sources in 4XMM-DR9s, compared to the first catalogue edition 3XMM-DR7s.
| Description | 4XMM-DR9s | 3XMM-DR7s |
|---|---|---|
| Number of stacks | 1329 | 434 |
| Number of observations | 6604 | 1789 |
| Time span first to last observation | Feb. 03, 2000−Nov. 13, 2018 | Feb. 20, 2000−Apr. 02, 2016 |
| Approximate sky coverage | 480 sq. deg | 150 sq. deg |
| Approximate multiply observed sky area | 300 sq. deg | 100 sq. deg |
| Total number of sources | 288 191 | 71 951 |
| Sources with one contributing observation | 69 908 | 14 286 |
| Observed once with flag 0 or 1 | 65 307 | 14 076 |
| Observed once and manually flagged | 3668 | / |
| Sources with several contributing observations | 218 283 | 57 665 |
| Multiply observed sources with flag 0 or 1 | 191 497 | 55 450 |
| Multiply observed and manually flagged | 19 224 | / |
| Multiply observed with a total detection likelihood of at least six | 181 132 | 49 935 |
| Multiply observed with a total detection likelihood of at least ten | 153 487 | 42 077 |
| Multiply observed extended sources (extent radius ≥6″) with flag 0 or 1 | 9234 | 2588 |
| Multiply observed point sources with VAR_PROB≤10−3 and flag 0 or 1 | 11 327 | 3301 |
| Multiply observed point sources with VAR_PROB≤10−5 and flag 0 or 1 | 7182 | 1839 |
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