The FIRST (Faint Images of the Radio Sky at Twenty centimeters) survey now covers 1550 deg2 of sky, where and This yields a catalog of 138,665 sources above the 07h16 [ a [ 17h40 28 .3 [ d [ 42. survey threshold of 1 mJy, about one-third of which are in double-lobed and multicomponent sources.
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Cress et al. (1996) studied this question.