Table 1.
Breakdown of FXRT candidates as a function of the selection criteria proposed in Sect. 2.5.
| Criterion | Candidates |
|||
|---|---|---|---|---|
| # Constrained | # Total removed | # Uniquely removed | # Remaining | |
| (1) | (2) | (3) | (4) | (5) |
| 1) Archival X-ray data | 645 (*) | 558 | 72 | 170 |
| 2) Cross-match with stars/Gaia | 728 | 454 | 56 | 66 |
| 3) NED + SIMBAD + VizieR | 728 | 525 | 31 | 29 |
| 4) Archival images (†) | – | 9 | 9 | 20 |
| 5) Instrumental effects (†) | – | 6 | 6 | 14 |
Notes. Column 1: Criterion. Column 2: Number of candidates constrained by this criterion. Column 3: Number of candidates removed that would be cut at this stage if we disregard all previous stages. Column 4: Number of candidates that are solely removed by this criterion, and not any other. Column 5: Running total number of candidates that remain after applying this criterion.
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