Table 7
External catalogue XM results: the number of objects compared with the number of matched sources, the fraction of matched Gaia sources and the fraction of matched external catalogue sources.
| Catalogue | Number of | Number of best | % of Gaia | % of external cat | Number of |
| sources | matchesa | sources matcheda | sources matcheda | neighbours | |
|
|
|||||
| UCAC4 | 113 728 883 | 117 369 911 | 10.3 | 95.4 | 117 797 078 |
| GSC2.3 | 945 592 683 | 844 343 562 | 73.9 | 74.8 | 937 463 454 |
| PPMXL | 910 468 710 | 714 367 484 | 62.5 | 73.1 | 801 968 492 |
| SDSS DR9 | 469 029 929 | 97 018 148 | 8.5b | 20.6 | 98 411 313 |
| URAT-1 | 228 276 482 | 209 888 464 | 18.4b | 91.8 | 209 888 621 |
| 2MASS | 470 992 970 | 447 946 619 | 39.2 | 89.3 | 452 852 361 |
| allWISE | 747 634 026 | 311 033 691 | 27.2 | 41.4 | 311 035 922 |
Notes. The number of sources in the Neighbourhood tables is also listed.
“Number of best matches” includes the mates. This column and “% of Gaia sources matched” indicate distinct Gaia sources. “% of external cat sources matched” indicates the fraction of distinct external catalogue sources matched.
The percentage of matched Gaia sources in this case does not take into account the external catalogue limited sky coverage (see Fig. 2).
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