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The spectrum of the diffuse gamma-ray background in the 0.001 - 100 MeV energy range as measured by OSO-3, Rangers 3 & 5, Apollo 15, and SAS 2.
The spectrum of the diffuse gamma-ray background in the 0.5 - 3.0 MeV energy range as measured by Lunas 10 & 12, Cosmos 60, and Ranger 3.