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Average diurnal variation of the magnetic north component (H) at TAR and STP (left) and at NUR and STP (right). Black curves correspond to STP and blue curves to NUR and TAR. Results for the eastward component (E), not plotted here, show an equally good similarity. We assumed that the declination at NUR and TAR is 5.5° (positive eastwards) when determining the magnetic north and east components from the geographic components (X, Y).
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