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- redshifted[remove]1,595
- galaxies733
- photometry668
- optical astronomy491
- spectroscopy482
- galaxy clusters375
- surveys370
- quasars336
- active galactic nuclei284
- infrared photometry267
- x-ray sources221
- line intensities169
- sloan photometry162
- catalogs158
- infrared sources133
- radio astronomy130
- wide-band photometry107
- galaxy classification systems97
- radio sources87
- galaxy kinematics85