\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} which has a name 
(see ``Specifying Curves to Plot'' section \ref{Authoring_Dynamic_Plot_Curve}).

The key is the color of the foreground of the plot, specified in the 
\textbf{gnuplot} tag (see ``Authoring Dynamically Generated Plots'' section 
\ref{Authoring_Dynamic_Plot_Gnuplot}).