BestNeighbour output table content.
|Field name||Short description|
|SourceId||Gaia source identifier|
|OriginalExtSourceId||Original External Catalogue source identifier|
|AngularDistance||Haversine angular distance (arcsec)|
|NumberOfMatesa||Number of mates in Gaia catalogue|
|NumberOfNeighbours||Number of good neighbours in the second catalogue|
|BestNeighbourMultiplicitya||Number of neighbours with same probability as best neighbourb|
|GaiaAstrometricParams||Number of Gaia astrometric|
Notes. (a) Column available only for dense surveys. See Sects. 2 and 3. (b) Two neighbours with the same probability are normally sources with different identifiers, but exactly the same coordinates and coordinate errors. The cross-match algorithm is thus unable to distinguish them, and either can be selected as bestNeighbour.
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