White, G. J.; Watt, G. D.; Beckman, J. E.; Rose, W. B. and van Vliet, A. H. F.
Observations of the J = 2→1 transitions of 12C16O and 12C18O towards galactic H II regions.
Astronomy and Astrophysics, 84 pp. 212–215.
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Observations are reported of the J = 2→1 transitions of CO and 12C18O at 230 and 219 GHz respectively from a number of galactic sources. A map of the central 1/2° × 1/2° of the Orion A molecular cloud is presented. The spectra are interpreted to derive molecular densities and abundance ratios in the molecular clouds observed.
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