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Fig. 11
Δ as a function of the aspect ratio for four magnetic field solutions: the uniform-twist field (ut, magenta), the zero-order solution (0-o, blue), the first-order solution (1-o, red), and the MT field (MT, green). The values of Δ are approximately one half of the ΔB values because the values of ΔV are small, see Eq. (61).
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