Fig. 15.

Field line helicity distributions 𝒜s(x0) of (71). The columns from left to right represent time steps t = 0, 0.2, 0.4, 0.6, 0.8, 0.95 integrated on a domain [−4, 4]2 in x, y and [−24, 24] in z, with 400 × 400 field lines. The vertical direction indicates increasing scale s (except for the top line which is the total sum over s (it is the actual distribution 𝒜)).
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