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I'm wondering about an equation for the differential flux of atmospheric muons that looks like this:

[tex] \frac{dN_{\mu}}{dE_{\mu}} \approx \frac{0.14 E^{-2.7}}{cm^{2}.s.sr.GeV} \Bigg\{ \frac{1}{1 + \frac{1.1 E_{\mu}cos(\theta)}{115 GeV}} + \frac{0.054}{1 + \frac{1.1 E_{\mu}cos(\theta)}{850 GeV}} \Bigg\}[/tex]

Despite trawling the net, the only source I can find for it is one textbook (Cosmic Rays and Particle Physics, Thomas K. Gaisser (1990)). However, I'm finding this textbook pretty impenetrable. I want to understand how this equation was arrived at. I'm guessing based on this book it's a difficult thing to explain here but if anyone knows of any document that can get me to at least semi-understand this I would be most grateful.

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# Understanding Gaisser's atmospheric muon parameterization?

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