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Fig. 4.


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30-min maximum of the sum of GIC divided by the number of nodes in the Nordic high-voltage power grid in October 2003 as a function of |dH/dt|30 (a) and |E|30 (b) at UPS. Red crosses indicate the 15 largest values of GIC30. Triangles indicate the 15 largest values of |dH/dt|30 or |E|30. The blue curve is a fitted straight line.

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