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Measurement of the cosmic ray energy spectrum above 1 EeV at the Pierre Auger Observatory

The Pierre Auger Observatory is measuring extensive air showers initiated by ultra-high energy cosmic rays from simultaneous observation of fluorescence and surface detectors with unprecedented precision. The high statistics of the surface detector allows a good determination of the cosmic ray flux above an energy of 3 EeV. This bound is extended down to 1 EeV using a unique technique that exploits the hybrid detection power. The spectrum is presented displaying two clear features in the energy range between 1 and 100 EeV.