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Fig. 4.


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Sixty-one-day mean daily amplitude of the northward magnetic perturbations for the control case (MC2008; panel a) and the difference with C1908 and M1908 (panels b/c). Contours for the difference plots are at 0, ±5, ±10, ±20, and ±50 nT. Light (dark) shading indicates statistical significance at the 95% (99%) level.

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