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- photometry[remove]6,211
- infrared photometry2,891
- optical astronomy2,794
- galaxies1,767
- wide-band photometry1,318
- surveys838
- open star clusters758
- variable stars734
- redshifted668
- sloan photometry649
- radial velocity498
- globular star clusters485
- spectroscopy465
- infrared sources450
- ccd photometry432
- galaxy clusters426
- proper motions376
- hst photometry326
- x-ray sources309
- infrared astronomy302