

    \filetitle{zeroline}{Add zero line if Y-axis limits include zero}{grfun/zeroline}

	\paragraph{Syntax}
 
 \begin{verbatim}
 LN = zeroline(...)
 LN = zeroline(AX,...)
 \end{verbatim}
 \paragraph{Input arguments}
 
 \begin{itemize}
 \item
   \texttt{AX} {[} numeric {]} - Handle to an axes object (graph) to
   which the zeroline will be added; if not specified the current axes
   will be used.
 \end{itemize}
 \paragraph{Output arguments}
 
 \begin{itemize}
 \item
   \texttt{LN} {[} numeric {]} - Handle to the line ploted (line object).
 \end{itemize}
 \paragraph{Options}
 
 Any options valid for the standard \texttt{plot} function.
 
 \paragraph{Description}
 
 \paragraph{Example}


