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cleanup and formatting with a few clarifications

\label{Authoring_Dynamic_Plot_Label}

The \textbf{label} tag allows the author to place text at any position on the 
plot.  There may be many \textbf{label} tags on one plot and all the labels
which fall within the plot will show.  
The color used will be to foreground color of the plot and the font will be
the size specified for the plot, both of which are set in the 
\textbf{gnuplot} tag (see section \ref{Authoring_Dynamic_Plot_Gnuplot}).

\begin{itemize}
\item \texttt{justification of the label text on the plot}
``left'', ``right'', or ``center''.
\item \texttt{rotation of label (degrees)}
\item \texttt{x position of label (graph coordinates)}  
\item \texttt{y position of label (graph coordinates)} 
\end{itemize}

The text to be placed on the plot must be entered as well.