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- infrared photometry[remove]2,875
- photometry2,875
- optical astronomy1,468
- wide-band photometry954
- galaxies608
- open star clusters455
- surveys395
- infrared sources313
- variable stars309
- redshifted265
- infrared astronomy222
- proper motions214
- young stellar objects214
- pre-main sequence stars209
- spectroscopy209
- radial velocity190
- stellar spectral types179
- x-ray sources174
- globular star clusters165
- sloan photometry159