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A review is given of the present status of measurements of the spectrum of the microwave background. Factors that limit experimental accuracy are discussed with particular reference to high-frequency measurements. A selection of the available measurements yields a data set that is reasonably consistent with the black-body spectrum for a temperature of 2.9 K. A simple statistical analysis suggests either that there are errors in the data set, or that deviations from a black-body spectrum exist. The difficulties inherent in properly averaging the results from different observers are described. Prospects for improved measurements are summarized.
Data Analysis, General Physics, Radiations 640101* -- Astrophysics & Cosmology-- Cosmic Radiation, Blackbody Radiation, Electromagnetic Radiation, Materials science, Microwave Radiation, Background Radiation, 71 Classical And Quantum Mechanics, Cosmic Radiation, Ionizing Radiations
Data Analysis, General Physics, Radiations 640101* -- Astrophysics & Cosmology-- Cosmic Radiation, Blackbody Radiation, Electromagnetic Radiation, Materials science, Microwave Radiation, Background Radiation, 71 Classical And Quantum Mechanics, Cosmic Radiation, Ionizing Radiations
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