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Positions match the ideal 0.25-m grid ………………………………….. 24 corrections ……………………………………………………………… 25 Sensor positions are coincident with the virtual tetrahedron vertices …. 25 Assumptions Applied to the Spin-Calibration Data……………………………...25 The background field was stable and its tensor everywhere zero ……… 25 Deconvolving Bin Steps from Analog, and Matching Axes for Precision By Rotation ………………………………………………………………37 Sensor 1 is perfectly aligned with the virtual tetrahedron ………………26 The sensor temperatures did not vary ………………………………….. 26 Raw-Data Conversion……………………………………………………………26 Basic Data Forms ………………………………………………………. 26 Recording Method ……………………………………………………….26 Conversion Program …………………………………………………….27 27 Tracking…………………………………………………………………………. Removal of Intervening Data Records and Noisy Samples……………………...27 Bin Conversions………………………………………………………………….27 Application of Spin-Calibration Results for Converting Voltages to Fields……. 29 Axis Polynomial………………………………………………………… 29 Orthogonality Correction……………………………………………….. 30 Attitude Correction ……………………………………………………... 30 Temperature Corrections ………………………………………………..31 Differencing Magnetic Fields to Obtain Initial Gradients………………………. 31 Ten-Second Averaging of Gradients to Obtain Station Gradient Data…………..32 Thermal-Drift Correction………………………………………………………...33 Unknown Constant……………………………………………………… 34 In Lieu of Temperature-Dependent Spin-Cal Coefficients …………….. 34 Gradient Collocation……………………………………………………………..34 Converting Sensor-Pair Gradients to a Tensor………………………………….. 37

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