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| abstraction > data collection > database > sky survey |
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| sky survey comparison table | |||
| Subject | is an instance of | has acronym | is a kind of |
|---|---|---|---|
| DEep Near Infrared Survey | sky survey | DENIS | |
| Palomar Sky Survey | PSS | sky survey | |
| Two-Micron All-Sky Survey | sky survey | 2MASS |
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