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Subject
- intergalactic medium[remove]31
- redshifted28
- spectroscopy24
- optical astronomy20
- galaxies14
- quasars14
- ultraviolet astronomy9
- photometry8
- surveys6
- active galactic nuclei5
- line intensities5
- sloan photometry4
- absolute magnitude3
- apparent magnitude3
- chemical abundances3
- h i line emission3
- hst photometry2
- x-ray sources2
- astronomical object identification1
- bl lacertae objects1
