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- infrared photometry[remove]3,725
- photometry3,725
- optical astronomy2,163
- wide-band photometry1,481
- galaxies661
- open star clusters478
- variable stars420
- surveys415
- infrared sources324
- redshifted273
- spectroscopy265
- radial velocity248
- pre-main sequence stars237
- infrared astronomy232
- young stellar objects224
- proper motions216
- ccd photometry202
- sloan photometry200
- multiple stars197
- eclipsing binary stars196
