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Subject
- astrophysical masers1
- catalogs1
- galaxies1
- h ii regions1
- infrared astronomy1
- infrared photometry2
- infrared sources1
- interstellar cloud[remove]4
- molecular clouds2
- nebulae3
- optical astronomy1
- photometry2
- pre-main sequence stars1
- protostars1
- radial velocity1
- radio astronomy1
- radio sources1
- wide-band photometry1
- young stellar objects1
