      \fitem{plot}(\emph{variable}) or \atvar{plot}(\emph{variable}$_1$,
      ... \emph{variable}$_p$) is a special form (the arguments are
      restricted to be variables). Calling this special form plots the
      values stored in the history of the variables as time series in
      absolute time using the \texttt{gnuplot} function. See
      page~\pageref{sec:plot} and also the library function \atvar{rplot}.




      %%% -------------------------------------------------------

