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Figure F286. Comparison of Goettingen Borehole Magnetometer (GBM) and General Purpose Inclinometry Tool (GPIT) magnetic data showing similar patterns of relative highs and lows but differences in magnitude between instruments. Vertical components from both instruments show an offset from the recent field (International Geomagnetic Reference Field) expected for this latitude displayed as a constant line, as well as an offset with respect to each other.

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