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1 3 CO (J = 1 - 0) and C 18 O (J = 1 - 0) emissions of the OMC-3 in the Orion A molecular cloud were mapped with the 13.7 m millimeter wave telescope of Purple Mountain Observatory using a higher spatial resolution. The overall structure of the cloud and the average physical parameters of all the 13 CO (J = 1 - 0) and C 18 O (J = 1 - 0) cores are derived...