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Abstract:
Using the measurements of the muon flux with the Frejus detector
as example the existing measurements of the depth dependence and the
energy spectrum at the detector location, and their limitations due
to systematic uncertainties (muon cross section, rock overburden,
angular dependence, etc.) are discussed. Especially the search for
the contribution of prompt muons, the boundary conditions for
the determination of the primary chemical composition, and the
consequences for large (km3) neutrino telescopes are discussed.
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