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- molecular physics[remove]50
- interstellar medium25
- atomic physics12
- galaxies12
- radio astronomy12
- co line emission10
- spectroscopy9
- star forming regions7
- millimeter astronomy6
- submillimeter astronomy6
- radio spectroscopy5
- infrared astronomy4
- surveys4
- young stellar objects4
- chemical abundances3
- galaxy kinematics3
- molecular clouds3
- astronomical models2
- h i line emission2
- infrared sources2