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Table 1
List of radio total flux-density observations used in the paper.
| ν | Time range | Telescope | Reference |
|
|
|||
| 408 MHz | 1975–1990 | Bologna | Bondi et al. (1996a) |
| 4.8 GHz | 1982–2006 | Michigan | Aller et al. (1999, 2003) |
| 6.7 GHz | 1967–1971 | Algonquin | Medd et al. (1972) |
| 8 GHz | 1970–2006 | Haystack, Michigan | Dent & Kapitzky (1976), Aller et al. (1999, 2003) |
| 10.7 GHz | 1967–1971 | Algonquin | Medd et al. (1972), Andrew et al. (1978) |
| 14.5 GHz | 1970–2006 | Haystack, Michigan | Dent & Kapitzky (1974), Aller et al. (1999, 2003) |
| 22 GHz | 1989–2001 | Metsähovi | Teräsranta et al. (1998) |
| 37 GHz | 1989–2001 | Metsähovi | Teräsranta et al. (1998) |
| 90 GHz | 1986–1994 | SEST | Steppe et al. (1988, 1992), |
| Tornikoski et al. (1996), Reuter et al. (1997) | |||
| 230 GHz | 1987–1993 | SEST | Steppe et al. (1988), Tornikoski et al. (1996) |
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