Open Access
Table 2
Composition of the XGB dataset.
| Class | No. of sources | Fraction |
|---|---|---|
| Stars | 64 814 386 | 86.273% |
| Galaxies | 27 729 | 0.037% |
| Low-z QSOs and AGNs | 91 453 | 0.122% |
| High-z QSOs | 10 866 | 0.014% |
| Othera | 4775 | 0.006% |
| unclassified | 10 177 696 | 13.547% |
Notes. (a)Any other spectral classification, such as Type 2 active galactic nuclei, HII region, BL Lac, etc.
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