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Subject
- diffuse molecular clouds[remove]21
- h i line emission7
- interstellar medium7
- surveys6
- molecular clouds4
- nebulae4
- optical astronomy4
- photometry4
- spectroscopy4
- early-type stars3
- h ii regions3
- infrared photometry3
- interstellar reddening3
- astronomical object identification2
- chemical abundances2
- extinction2
- galaxies2
- ultraviolet astronomy2
- wide-band photometry2
- young stellar objects2
