Probability density function of the magnetic obliquity in the ISM boxes, and with η0 = 0.1 and , at time t = 20 Myr with CR streaming (blue) or without (green), compared to the random distribution in black dashed. Those simulations are more likely to have magnetic field perpendicular to the normal of shocks than for a random distribution, therefore, lowering the CR acceleration efficiency compared to the averaged random distribution, i.e. ⟨ζ⟩ = 0.302.
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