This paper is an update of part of an article in the SPIE Journal for February-March 1966, entitled "Symbols, Units, and Nomenclature for Atmospheric Transmission," by Irving J. Spiro, R. Clark Jones, and David Q. Wark. In the interim 1966-1975, Fred Nicodemus, lately of the Naval Weapons Laboratory at China Lake, California and now with the National Bureau of Standards (NBS) at Gaithersburg, Maryland, has done an outstanding job in solidifying the concepts proposed (as a committee action) in 1966.
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