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Subject
- active galactic nuclei2
- astronomical models2
- astronomical object identification7
- astrophysical masers4
- atomic physics1
- bl lacertae objects1
- chemical abundances2
- co line emission5
- early-type stars2
- exoplanets1
- extinction1
- galaxies15
- galaxy classification systems6
- galaxy clusters1
- galaxy planes3
- gamma-ray astronomy8
- h alpha photometry3
- h ii regions10
- hst photometry7
- infrared astronomy4
