Systematic uncertainties Cosmic rays 8 Cosmology 8 Uncertainty analysis 8 Augers 6 Observatories 6 Pierre Auger observatory 6 Calibration 4 Calorimetric measurements 4 Cosmic ray measurement 4 Fluorescence 4 Hadrons 4 Photons 4 Tellurium compounds 4 Ultra high-energy cosmic rays 4 Ultra-high energies 4 Ultra-high energy cosmic rays 4 ATLAS detectors 2 ATLAS experiment 2 Aerosols 2 Air fluorescence method 2 Air fluorescences 2 Air showers 2 Astroparticle physics 2 Atmosphere 2 Atmospheric conditions 2 Atmospheric fluctuations 2 Azimuthal distributions 2 Bi-static lidar 2 Binary collisions 2