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| physical object > artifact > device > instrument > optical device > detector > spectrograph > diffraction grating spectrograph | 
| diffraction grating spectrograph comparison table | |
| Subject | has definition | 
|---|---|
| HRS | High-Resolution Spectrograph (Hubble). | 
| Littrow | The configuration of a diffraction grating spectrograph in which the diffracted ray returns along the same direction as the incident ray. | 
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