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Published online by Cambridge University Press: 26 May 2016
The three fields chosen for the first observations with the Very Small Array (VSA), a total area of ˜ 200 deg2, are being surveyed with the Ryle Telescope at 15 GHz. This is the only wide-field survey at a comparable radio frequency; its purpose is to investigate the source population and to define a catalogue of the foreground sources which must be monitored by the VSA during its observations. We present preliminary source counts.