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| Space Telescope Science Institute |
| STIS Instrument Handbook |
| help@stsci.edu |
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Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 20 > Chapter 13: Spectroscopic Reference Material > 0.2X0.09 Aperture
This slit is used with high resolution echelle gratings. This slit is two pixels wide in dispersion for these gratings, providing optimal spectral resolution and line profiles.
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