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Subject
- h ii regions[remove]563
- photometry172
- radio astronomy131
- galaxies118
- infrared photometry113
- infrared astronomy77
- infrared sources75
- interstellar medium75
- optical astronomy74
- spectroscopy74
- young stellar objects66
- chemical abundances60
- molecular clouds47
- millimeter astronomy40
- submillimeter astronomy40
- radio sources39
- magellanic clouds38
- astrophysical masers31
- radio continuum emission31
- milky way galaxy29
