BestNeighbour output table content.
|Field name||Short description|
|SourceId||Gaia source identifier|
|OriginalExtSourceId||Original external catalogue source identifier|
|AngularDistance||Haversine angular distance (arcsec)|
|NumberOfMates||Number of mates in Gaia catalogue|
|NumberOfNeighbours||Number of good neighbours in external catalogue|
|BestNeighbourMultiplicity||Number of neighbours with same probability as best neighbour|
|ProperMotionFlag||Use of Gaia proper motions (TGAS subsample)|
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