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The SHALON Cherenkov telescope has recorded over 2 × 10 6 extensive air showers during the past 17 years. The analysis of the signal at different zenith angles has included observations from the sub-horizontal direction Θ = 97 • . This inclination defines an Earth skimming trajectory with 7 km of air and around 1000 km of rock in front of the telescope. During a period of 324 hours of observation, after a cut of shower-like events that may be caused by chaotic sky flashes or reflections on thedoi:10.1051/epjconf/20125209010 fatcat:syxm6glpvjdgjgmu7myxt465c4