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GRAM-90, the most recent version of the Global Reference Atmosphere Model, has been released for use. The model is sponsored by NASA's Marshall Space Flight Center in Huntsville, Ala., and was developed at Georgia Tech.

GRAM-90, which has become something of a de facto standard within the aerospace community, is a blend of three empirical model atmospheres affording latitude, longitude, and monthly variability over a continuous altitude range of 0–700 km.