deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index 093165d..07f5c63 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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\end{enumerate}  we propose an edge detection method based on the analysis of eigenvalues of GGT.\begin{quote}  Considering the actual geological situation;  \end{quote} Considering the actual geological situation, the positive and negative density bodies usually coexist simultaneously. The proposed \href{http://www，baidu.com}{}method \href{http://}{www.baidu.com}method  has designed to outline the positive/negative density bodies with the corresponding values.