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Fig. 7

image

Left panel: evolution of the magnetic helicity computed with the practical DeVore method (dashed line) and with the DeVore-Coulomb method (red line). Their difference is plotted with an orange line (cf. right axis). Right panel: volume magnetic helicity (, black dashed line) and its decomposition in the DeVore-Coulomb case. The plotted curves are similar to the bottom panel of Fig. 2.

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