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Table 1

Summary of magnetic energy decay rates and ηeff.

IC Height Field BC Flow BC η (km2 s-1) e-folding time (min) ηeff (km 2 s-1)

2 × 2 normal vertical closed 11 52 145
2 × 1 nomal vertical closed 11 117 129
2 × 2 normal potential closed 11 37 202
2 × 2 tall vertical closed 11 62 123
2 × 2 tall vertical open 11 34 225
2 × 2 tall potential open 11 22 341
2 × 2 normal vertical closed 5.6 75 101

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