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This document, presented at Aspen 2005, delves into the cosmic ray (CR) spectrum and its origins. It explores the galactic modulation of extragalactic cosmic rays, outlining the motivation, simulation methods, and results that shed light on this complex interaction. A model presenting the all-particle spectrum near the knee region is discussed, along with an analysis of the energetics associated with hypothetical extragalactic cosmic rays. The findings contribute to the understanding of cosmic ray behavior and the potential sources beyond our galaxy.
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