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Table 1
Characteristics of the catalogs participating to our compilation of quasars both for the LQAC-2 and the LQAC.
| Catalog | Flag | Nature | Nbs. of | Nbs. of | |
| Name | quasars | quasars | |||
| (LQAC2) | (LQAC) | ||||
|
|
|||||
| ICRF | A | radio | 3414 | 717 | |
| VLBA | B | radio | 5198 | 3357 | |
| VLA | C | radio | 1858 | 1857 | |
| JVAS | D | radio | 2118 | 2118 | |
| SDSS | E | optical | 126 577 | 74 868 | |
| 2QZ | F | optical | 23 660 | 22 971 | |
| 2df-SDSS LRG | G | optical | 9058 | 0 | |
| FIRST | H | radio | 969 | 969 | |
| HB | I | opt. & radio | 6721 | 7245 | |
| 2MASS | J | infrared | 25 252 | – | |
| GSC2.3 | K | optical | 154 900 | – | |
| B1.0 | L | optical | 148 894 | – | |
| V&V | M | optic. & radio | 80 667 (⋆) | 85 189 | |
Notes. (⋆) indicates that we do not use the SDSS quasars in the count.
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