| ExtObjectId | ExtObjectId | Unique EXT object identifier [None] | |
| MaxGbandMagnitudeError | float | Maximum Gaia G magnitude error for a source to be used for astrometric calibration or validation [mag] | |
| MaxPositionalError | float | Maximum positional uncertainty for a source to be used for astrometric calibration or validation [mas] | |
| MinAngularDistance | float | Minimum distance to nearest neighbour for a source to be used for calibration or validation [arcsec] | |
