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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 > 0.2X0.2 Aperture
The “utility” slit for the echelle gratings. This slit is the most photometric of the supported echelle slits and has the highest throughput for photon statistics. Starting in Cycle 12, this slit is also supported for use with the first order gratings, and it is the recommended aperture for first order MAMA snapshot and survey programs that do not have a scientific need for a long-slit (see Section 2.8 “STIS Snapshot Program Policies”).
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