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Subject
- planetary nebulae[remove]282
- spectroscopy76
- photometry55
- galaxies43
- radial velocity39
- chemical abundances37
- optical astronomy35
- infrared photometry28
- magellanic clouds25
- radio astronomy23
- infrared astronomy20
- h ii regions18
- infrared sources15
- wide-band photometry14
- stellar distance12
- surveys11
- apparent magnitude9
- giant stars9
- milky way galaxy7
- radio sources7
