Fig. 4
Energy change for two flux ropes merging and relaxing against final rope radius, both with (green, λ1 = 1.4λ2 = 1.8; cyan, λ1 = λ2 = 1.8) and without (blue, λ1 = 1.4λ2 = 1.8; red, λ1 = λ2 = 1.8) a simulation box. Positive values represent an increase in energy from the initial to final state. The vertical line represents conservation of volume.
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