First Sentence:
The existence of an isotropic X-ray background has been established since the discovery flight of 1962 (Giacconi et al. 1962), Figure 1.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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local volume emissivity, spectral paradox, emissivity arising, predicted source counts, extragalactic intensity, source number counts, extragalactic flux, isotropy constraint, kev background, kev band, guard rate, medium sensitivity survey, energy spectral index, emissivity corresponding, optical luminosity functions, comoving number density, optical counts, compton reflection, euclidean slope, quasar counts, mean spectral index, special galaxies, local luminosity function, pure luminosity evolution, clustering evolution
Key Phrases - Capitalized Phrases (CAPs):
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Della Ceca, Extended Medium Sensitivity Survey, Channel Energy, Goddard Space Flight Center, San Diego, Space Sci, Great Attractor, Space Res, University of California, University of Maryland, Draco Nebula, Spectrum X-r, University of Wisconsin, New York, University of Tokyo, Conference Proceedings, Line Energy, Monte Carlo, Notices Roy, Physics Reports, South Atlantic Anomaly, Soviet Union, Yamada Conference
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