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GIC: varying earthing resistance

**Changes in GIC due to varying earthing resistances:**

The resistances are modified by multiplying them by a constant C (C=1 corresponds to the original model). Transmission line resistances are not changed. Uniform northward and eastward fields show how GIC decreases with increasing resistances.

Note that GIC is quite insensitive to small changes in the earthing resistances when compared to the original model. Only if the resistances are close to zero, there are more prominent differences. (Zero earthing resistances do not lead to infinite currents, since there are still non-zero line resistances.)