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...f the field is measured in gammas or the equivalent SI unit of nanoteslas (nT), and it varies from about 60,000 gammas in a vertical direction at the pol ...netic field. Modern instruments have a sensitivity of 0.01 gammas (or 0.01 nT). Gradients of the field are sometimes measured as well. Data are recorded

...beneath flight level. The residual magnetic contours (a) are shown at a 2-nT interval. The interpreted shear zones are traced along the linear gradients