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Table 1
Number of epochs and sources listed for each catalogue.
Catalogue | Observations | Unique sources |
|
||
SDSS-DR7Q | / | 105 783 |
SDSS-DR12Q | / | 297 301 |
3XMM-DR5 | 565 962 | 396 910 |
MEXSAS | 7837 | 2700 |
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