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- atomic physics[remove]763
- spectroscopy107
- interstellar medium78
- chemical abundances33
- radio astronomy24
- infrared astronomy23
- radio spectroscopy22
- astronomical models19
- ultraviolet astronomy19
- the sun14
- molecular physics12
- line intensities10
- molecular clouds8
- stellar atmospheres8
- stellar atmospheric opacity8
- millimeter astronomy7
- submillimeter astronomy7
- planetary nebulae5
- quasars5
- chemically peculiar stars4
