Radio-optical-NIR properties of the identified radio sources. Panel a: mag z from the Dec survey vs. the radio flux; panel b: (zDec -K) colour vs. zDec magnitude; panel c: (zDec -K) colour vs. radio flux; panel d: (zDec -K) colour vs. radio-to-optical ratio R. Red symbols show objects with mag zDec > 21.5 (see text fordetails).
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