\label{Authoring_Dynamic_Plot_Key}

The \textbf{key} tag causes a key to be drawn on the plot when it is generated.
The key will contain an entry for each \textbf{curve}
\ref{Authoring_Dynamic_Plot_Curve} which has a name.  

The key is the color of the foreground of the plot, specified in the 
\textbf{gnuplot} \ref{Authoring_Dynamic_Plot_Gnuplot} tag.