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\section{Introduction}  Edge detection is \textbf{Boldface the words}required for interpretation of gravity field data,and has been widely used in tectonic studies and mineral explorations\cite{Paterson_1985}. To gain a better understanding of gravity sources,\textit{Italic some words;}  a variety of methods based on the use of directional derivatives   \verb|verb code #include<>\\ using name std;| name;|  of different orders have been developed to locate anomalous source boundaries.\\  \begin{itemize}  \item first1\item second2