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Table 1

Division of the XSS sample into source types.

Source type All Hard+soft Hard-only

AGN 181 160 21
Galaxies 38 16 22
Clusters 10 10 0
Stars 53 51 2
Other 27 17 10
Unidentified 178 0 178

Total 487 254 233

Notes. This includes the 68 hard-only sources with ′′ which were not formally included in the identification process.

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