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In the fluorescence detection of ultra high energy (> 10**18 eV) cosmic rays,the number of emitted fluorescence photons is assumed to be proportional to theenergy deposited in air by shower particles. We have performed measurements ofthe fluorescence yield in atmospheric gases excited by electrons over energiesranging from keV to hundreds of MeV in several accelerators. We found thatwithin the measured energy ranges the proportionality holds at the level of few%.

Energy Dependence of Air Fluorescence Yield measured by AIRFLY