Fig. 9
Field vectors at dimensionless times a) t ≈ 8.4, b) 9.9 and c) 10.6, for Model 6 with the diffusivity contrast parameter ηa = 4. The arms are removed between τ = 8.5 and 10.5, and panel c) shows that the interarm regular fields appear almost immediately after the arms reappear. The anomalously long vectors are the result of a field injection just before τ = 10.6.
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