deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index 97bfeb7..f0db316 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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\section{Introduction}  Edge detection is required \textbf{required  for interpretation of gravity field data,and data},and  has been widely used in tectonic studies and mineral explorations\cite{Paterson_1985}. To gain a better understanding of gravity sources, a sources,\textit{a  variety of methods based on the use of directional directional}  derivatives of different orders have been developed to locate anomalous source boundaries.\\ \begin{itemize}  \item 123\\456\\789  \end{itemize}  In this paper,   \begin{enumerate}  \item 123\\456\\789  \end{enumerate}  we propose an edge detection method based on the analysis of eigenvalues of GGT. 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 method \href{http://www，baidu.com}{}method  has designed to outline the positive/negative density bodies with the corresponding values.