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Published online by Cambridge University Press: 03 August 2017
In order to study the excitation conditions in the Orion-A region, we applied an LVG code to 12CO, 13CO and C18O data obtained with the AT&T Bell Laboratories 7-meter telescope in USA (CO isotopes: J = 1 — 0, CS: J = 2 — 1) and the radiotelescope of the "Groupe d'Astrophysique de Grenoble" in France (CO isotopes: J = 2 — 1).