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- radio spectroscopy[remove]124
- interstellar medium45
- radio astronomy26
- spectroscopy25
- atomic physics22
- molecular clouds19
- galaxies15
- infrared astronomy11
- young stellar objects10
- chemical abundances8
- co line emission8
- active galactic nuclei7
- comets7
- giant stars7
- quasars7
- surveys7
- infrared sources6
- interferometry5
- milky way galaxy5
- molecular physics5
