Fig. 24
Sky coverage of the surveys listed in Table 2, in Galactic coordinates. Green points: sources present in both ≃1 GHz (NVSS or SUMSS) and 4.85 GHz (GB6 or PMN) catalogues; blue points: sources in the NVSS catalogue only; yellow points: sources in the SUMSS catalogue only; red points: sources in the PMN catalogue only; white regions: not covered by any survey.
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