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The ULTRA experiment has been designed in the framework of the EUSO project to provide quantitative measurements of the reflected/diffused signal produced by the EAS impacting on the Earth surface. The detector is a hybrid system consisting of an UV optical detection unit, the UVscope, and an array of scintillators, the ETscope (EAS Telescope). The UVscope is used to detect Cherenkov diffused UV light from EAS which are detected in coincidence by the ETscope array. The atmospheric transmissiondoi:10.15161/oar.it/1449009599.88 fatcat:gprbcrwkobedbhjypl6ewhrdb4