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The GRIS instrument is flown on a gondola from a high-altitude, helium-filled balloon at a typical altitude of ~40 km. The instrument consists of seven of the world's largest, high-purity, n-type germanium (Ge) detectors. The detectors are cooled to liquid nitrogen temperatures (in order to achieve high resolution) and are surrounded by a thick anti-coincidence shield which allows the rejection of background events from true astrophysical events.
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