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• 2007-07-04 22:51 Mvannier 1150×953× (326846 bytes) Figure adapted from: Astrionics System Handbook, revised ed., NASA MSFC No. IV-4-401-1, NTIS Doc. N70-70002, 1 November 1968, 418 pp. (International Business Machines Corporation working under NASA Contract NAS8-14000).