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The High Resolution Fly's Eye (HiRes) was a Cherenkov detector to detect cosmic-ray operating in western Utah from 1997 to 2006. It was a follow-on to the Fly's Eye and precursor to the current Telescope Array Project (TA). Compared to the Fly's Eye, which watched the whole sky for air showers, HiRes concentrated on a portion of the sky but with smaller pixels providing better angular resolution. An initial configuration (HiRes-I) used a ring of 22 telescopes covering elevations from 3° to 17°. An additional configuration (HiRes-II) was later added some distance away, covering elevations from 3° to 31°. Underground muon detectors collected additional data regarding the aftermath of the air showers.