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Fig. D.1

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Top: Normalized Z2(s) according to Eq. (D.4) for the simplified one-dimensional case, plotted for selected values of Alfvénic Mach number m ∈ {1.1, 2.0} and expansion exponent δ ∈ {1, 2}. Bottom: The same for σc(s) according to Eq. (D.3). The dotted line marks the asymptotic value of the m = 2.0 case as given by Eq. (D.5).
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