Fig. A.1
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Histograms of log(δB/B0) for a purely toroidal field (left) and for a field with 20% perturbations added (right). The dashed red line indicates the mean value of δB/B0. In the toroidal case, values remain close to machine precision, confirming δB ≈ 0; whereas with a 20% perturbations the mean shifts to ≃ 0.2, as expected from the imposed randomness.
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