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Table 3

Cross-identification flags (CIF).

CIF Definition of the flag N

0 Confirmed XMM-OM detection with unique EIS/COMBO-17 cross-identification 988
1 Reliable XMM-OM counterpart of an EIS/COMBO-17 source with multiple XMM-OM cross-identifications 35
2 Confirmed UVW2/UVM2 detection without UVW1 and U counterparts 8
3 Ambiguous XMM-OM counterpart of an EIS/COMBO-17 source with multiple XMM-OM cross-identifications 38
4 Ambiguous EIS/COMBO-17 counterpart of an XMM-OM source with multiple EIS/COMBO-17 cross-identifications 4
5 Dubious UVW1 detection without U counterpart or potentially wrong cross-identification in the EIS and/or COMBO-17 survey 56

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