| Frequency | Reference | Data | % |
| MHz | |||
| (1) | (2) | (3) | (4) |
| 151 | Hales et al. (1988) | 6C Survey | 98 |
| 327 | Rengelink et al. (1997) | WENSS | 100 |
| 408 | Ficarra et al. (1985) | B3 Survey | 100 |
| 1465 | Condon et al. (1998) | NVSS | 100 |
| 4850 | Kulkarni et al. (1990) | Effelsberg | |
| Gregory et al. (1996) | GB6 | 100 | |
| 4860 | Fanti et al. (2001) | VLA | 100 |
| 8460 | Fanti et al. (2001) | VLA | 100 |
| 10 550 | Gregorini et al. (1998) | Effelsberg | 100 |
| 14 940 | this article | VLA | 67 |
| 32 000 | Mack (private communication) | Effelsberg | 14 |
| 230 000 | Klein et al. (1996) | IRAM | 24 |
| Note. Column 1: observed frequency; Col. 2: reference; Col. 3: data; Col. 4: percentage of the observed B3-VLA CSS sample. The percentage refers to the sample of 84 sources (see Sect. 4.4.2). |