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Subject
- x-ray sources[remove]1,429
- photometry349
- surveys287
- active galactic nuclei286
- galaxies249
- redshifted227
- optical astronomy210
- infrared photometry195
- galaxy clusters178
- astronomical object identification134
- radio astronomy119
- open star clusters117
- quasars115
- infrared sources103
- radio sources100
- pre-main sequence stars96
- gamma-ray astronomy90
- wide-band photometry89
- spectroscopy85
- infrared astronomy80