The Seventh Cambridge Survey of radio sources (7C 151-MHz survey) was carried out at the Mullard Radio Astronomy Observatory by the Cavendish Astrophysics Group, using the Cambridge Low-Frequency Synthesis Telescope. In 2007, the final refinement stage of the 7C survey resulted in a reference catalog, one of a sequence of Cambridge low-frequency radio range catalogs characterizing extra-galactic radio sources.
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