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Figure F10. A. Schematic of Göttingen Borehole Magnetometer (GBM) showing inclinometer, fiber-optic gyros, and Förster-magnetometer triplet (from Virgil et al., 2010). B. Schematic drawing of GBM tool string as deployed downhole during Expedition 330, including a centralizer (to keep GBM in center of hole) and two sinker bars (made of tungsten carbide and nonmagnetic aluminum), with the nonmagnetic one positioned just above the GBM.

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