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Subject
- x-ray binary stars[remove]177
- x-ray sources54
- photometry40
- galaxies33
- optical astronomy30
- wide-band photometry20
- spectroscopy18
- infrared photometry17
- globular star clusters15
- astronomical models14
- radial velocity11
- astronomical object identification9
- line intensities8
- pulsars8
- surveys8
- cataclysmic variable stars7
- radio astronomy7
- accretion6
- active galactic nuclei6
- gamma-ray astronomy6
