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Table 4

Cross-identifications of the XMM-OM sources in the reference catalogues.

Survey Radius Cross-id Good Prob

GALEX 2.5 957 877 8.9
ACES 1.0 751 694 1.2
Master Catalogue 1.0 191 173 2.5
Chandra 4 Ms 2.0 164 158 4.1
XMM-Newton 3.5 33 31 12.1

Notes. Radius: match radius of the cross-correlation in arcsec. Cross-ID: total number of cross-identifications. Good: cross-identifications of good subsample sources. Prob: probability of false matches.

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