Abstract
The cosmic-ray muon momentum spectrum and charge ratio up to momenta \ensuremath{\simeq} 10 TeV/c have been measured with high accuracy. The power index of the differential spectrum of parent mesons at production gradually increases with momentum and becomes 2.87 \ifmmode\pm\else\textpm\fi{}0.06 in the momentum range 1 to 10 TeV/c. The charge ratio is almost constant at a value of 1.25\ifmmode\pm\else\textpm\fi{}0.05 from 0.1 to 10 TeV/c.
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