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- infrared photometry[remove]2,891
- photometry2,891
- optical astronomy1,472
- wide-band photometry955
- galaxies612
- open star clusters457
- surveys398
- infrared sources316
- variable stars313
- redshifted267
- infrared astronomy222
- young stellar objects216
- proper motions215
- pre-main sequence stars210
- spectroscopy209
- radial velocity194
- stellar spectral types179
- x-ray sources178
- globular star clusters165
- sloan photometry160