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- spectroscopy[remove]3,177
- galaxies787
- optical astronomy720
- photometry605
- infrared astronomy511
- redshifted489
- chemical abundances458
- radial velocity391
- line intensities352
- quasars300
- infrared photometry265
- ultraviolet astronomy265
- surveys249
- active galactic nuclei228
- interstellar medium187
- infrared sources149
- multiple stars145
- giant stars142
- wide-band photometry142
- galaxy clusters141