The collection of magnetic gradiometer data using a configuration of two, three, or four magnetometers has become commonplace. One use of these data is to improve the accuracy and resolution of the gridded total magnetic field beyond what can be interpolated from a single magnetometer. This is especially important for anomalies over small magnetic sources that lie between survey lines and over linear sources that strike obliquely to the survey lines. As an alternative to improved accuracy and resolution, one can consider increasing the survey line spacing to obtain the equivalent total magnetic field, thereby reducing the survey cost.

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