Cilou on 07-Feb-2017 15:31:14 GMT about Gaia-ESO Survey: H{alpha} emission stars catalogue (Traven+, 2015)
Though entitled "Cross-identifications to Simbad, Vizier and ADS", this table is not a cross-identification with Simbad. It is just a cross-match with a search radius of 15'', taking the closest source whatever the distance between 0 and 15''. The "Xids" proposed in this table at more than 1-3'' from the Simbad position are most likely wrong. The accuracy of the positions in Simbad should have been taken into account. In many cases it is subarcsecond; for "stars in cluster" unidentified in 2MASS it can be a few arseconds.
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View annotation on catalogue J/A+A/581/A52