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Fig. 6
Maximum energy of accelerated protons as a function of (B/δB)2 in the case of parallel shocks for U = 160 km s-1, nH = 6 × 105 cm-3, and x = 0.6 with B = 50 μG (dotted line), 500 μG (dashed line), and 1 mG (solid line).
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