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Subject
- h alpha photometry[remove]144
- optical astronomy144
- photometry144
- infrared photometry53
- galaxies50
- wide-band photometry36
- open star clusters28
- h ii regions25
- surveys18
- galaxy clusters14
- line intensities12
- spectroscopy12
- pre-main sequence stars11
- emission line stars10
- ultraviolet photometry9
- ccd photometry8
- milky way galaxy8
- be stars7
- active galactic nuclei6
- catalogs6
