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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 form\ref {eq.(1)}  :\\ \begin{equation}  \label{eq.(1)}  T = \begin{bmatrix}