deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index a2c4a0f..2fa38e8 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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0 & 0 & 0 & 1  \end{tabu}  \right]  \end{equation}we \end{equation}  we  propose an edge detection method based on the analysis of eigenvalues of GGT. Considering the actual geological situation, the positive and negative density bodies usually coexist simultaneously. The proposed method has designed to outline the positive/negative density bodies with the corresponding values.