Figures depicting the changing internal topology of a flux tube caused by its large scale writhing. Panel a) depicts a twisted bundle of curves whose axis is a planar curve, while b) depicts the same field after a kinking deformation, showing how a section of the bundle at its apex has straightened out. Panels c) and d) depict corresponding figures but for an initially untwisted bundle. The apex becomes twisted through the kinking in d) where twist was reduced in b).
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