Gravity gradient tensor; Forward; Edge extraction.

重力张量梯度；正演；边界提取。

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Magnetic gradient tensor is that the three components of the magnetic field vector space rate of change, is able to do well for the dipole localization and tracking.

磁力梯度张量表示的是磁场矢量三个分量的空间变化率，能够很好地用于偶极子场源的定位跟踪。

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