The optical depth of the 158 micrometer um [¹²CII] line detection of the F=1 --> 0 [¹³CII] hyperfine-structure component - Stacey, G. J.; United States. National Aeronautics and Space Administration (München, Germany : Max-Planck-Institut für extraterrestrische Physik ; [Washington, DC ; National Aeronautics and Space Administration ; Springfield, Va. : National Technical Information Service, distributor, 1991)
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Keywords: Infrared spectra; Interstellar matter; Orion Nebula