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 - Compromise to support display in both contextual online help, and aggregated
  in manual (PDF).
  - Identify the "section" by name, because the \ref is converted to a question
    mark icon only, and not a number in online help context.

\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}).