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\section{Full gravity gradient tensor and its eigenvalue analysis}  \subsection{Theory of GGT}  \label{}   The practical gradio meter systems for rapidly measuring GGT have been developed (Bell et al., 1997; Jekeli, 1993). Mikus and Hinojosa (2001) propose the method of approximating of the GGT from measured gravity data. The full gravity gradient tensor, symbol T, can be written in the form[eq.\ref {eq.(1)}] form\ref {eq.(1)}  :\\ \begin{equation}  \label{eq.(1)}  T = \begin{bmatrix}  
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g_{xx} & g_{xy} & g_{xz} \\ g_{yx} & g_{yy} & g_{yz}\\g_{zx} & g_{zy} & g_{zz}   \end{bmatrix}  \end{equation}  \subsection{some eq or figure}  in this subsection I will show a equation about GGT。\\   \begin{equation}  \label{eq.2}  p = g_{xx}g_{yy} + g_{xx}g_{zz} + g_{yy}g_{zz}−g_{zx}g_{xz}−g_{xy}g_{yx}−g_{zy}g_{yz};  \end{equation}  \begin{equation}  \label{eq.3}  q = g_{xy}g_{yz}g_{zx} + g_{xz}g_{yx}g_{zy} + g_{zx}g_{yy}g_{xz} + g_{xy}g_{yx}g_{zz} + g_{xx}g_{zy}g_{yz};  \end{equation}