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- infrared photometry[remove]3,704
- photometry3,704
- optical astronomy2,155
- wide-band photometry1,476
- galaxies655
- open star clusters476
- variable stars415
- surveys411
- infrared sources320
- redshifted271
- spectroscopy265
- radial velocity244
- pre-main sequence stars236
- infrared astronomy232
- young stellar objects222
- proper motions215
- ccd photometry202
- sloan photometry199
- multiple stars197
- eclipsing binary stars195