Fig.1
Energy distribution of atmospheric muon backgrounds X:muon energy[GeV]
Blue:Elbert model
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Fig.2
First plot
Second plot
All:0.7<=cos(primary cosmic ray azimuth)<0.8 Gray:6.0<=log(primary cosmic ray energy[GeV])<6.5
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Fig.3
First plot
Second plot
All:7.5<=log(primary cosmic ray energy[GeV])<8.0 Red:0.1<=cos(primary cosmic ray azimuth)<0.2
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