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The Pierre Auger Observatory has been designed to measure the energy spectrum, the arrival direction, and the mass composition of cosmic rays above 1018 eV with a hybrid detector system. It will finally consist of an array of 1600 water-Cherenkov Surface Detectors (SD) on a 1.5 km triangular grid and 24 fluorescence telescopes (FD) in four stations on the perimeter of the 3000 km2 experimental area...
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