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New spreadsheet help files.

\label{Spreadsheet_Referencing_Cells}

\textbf{Cells}

Cells may be specified by simply writing their name.  \texttt{A17} will be
replaced with the value in row A column 17 before the perl is evaluated.

\textbf{Ranges}

Ranges \index{ranges, spreadsheet} specify rectangles of various shapes
in the spreadsheet, just as ranges do in traditional spreadsheets. 
Ranges must be enclosed in quotes.  Examples of legitimate ranges: 

\begin{itemize}

\item \textbf{``*''} - all rows, all columns 
\item \textbf{``B*''} - all rows in column B 
\item \textbf{``*5''} - all columns in row 5 
\item \textbf{``C5..F25''} - all cells in the rectangle between C5 and F25

\end{itemize}

Many functions accept ranges. For example, \&SUM(``d*'') will add 
up all cells in column d.

\textbf{Special References}

There is an additional means of referencing cells most used in the 
\textbf{template row} (\ref{Spreadsheet_Template_Row}).  
By using a ``#'' in the place of a row number
the spreadsheet will replace the # with the current row number.  For example
\texttt{B#} will be replaced with the contents of cell B7 in the row 7 and
the contents of B8 in row 8.