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Unfortunately, this interpretation was premature as a significant number of the sources listed were later found to be the product of 'confusion', the blending of several weaker sources in the lobes of the interferometer to produce the apparent effect of a single stronger source. Key data
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of the interferometer records later showed some aspects of the initial interpretation to have been broadly correct, with the correct measure of the (log(N),log(S)) slope of nearly -1.8 derived once confusion was taken into account.
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For a uniform distribution of radio sources the slope of the cumulative distribution of log(number, N) versus log (power, S) would have been -1.5, but the
Cambridge data apparently implied a (log(N),log(S)) slope of nearly -3.0.
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and 3CR surveys. The 3C survey also used the
Cambridge Interferometer, but at 159 MHz, which helped significantly reduce the 'confusion' (see above) in the later survey.
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Shakeshaft, JR; Ryle, M; Baldwin, JE; Elsmore, B; Thomson, JH (1955). "A survey of radio sources between declinations −38° and +83°".
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demonstrating this came from the then-recently commissioned
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and colleagues. It comprised a list of 1936 sources between
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in
Australia. However, subsequent statistical analysis by
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The survey was superseded by the much more reliable
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