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+\documentclass{article}
+\setlength{\textwidth}{130mm}
+\begin{document}
+\begin{table}{\bfseries Primary Energy Consumption}\\[1ex]
+\begin{tabular*}{130mm}%
+ {@{}ll@{\extracolsep{\fill}}r@{\hspace{1em}}@{\extracolsep{1em}}rr@{}}
+% {@{}ll@{\extracolsep{\fill}}r@{\extracolsep{1em}}rr@{}}
+% Try this column definition as alternative solution
+\hline
+\multicolumn{2}{@{}l}{Energy Source} & 1975 & 1980 & 1986\\ \hline
+\multicolumn{2}{@{}l}{Total Consumption}&&& \\
+\multicolumn{2}{@{}l}{(in million tons of BCU)\footnote{BCU =
+ Bituminous Coal Unit (1 ton BCU corresponds to the heating
+ equivalent of 1 ton of bituminous coal = 8140 kwh)}}
+ & 347.7 & 390.2 & 385.0 \\
+of which & (percentages)\\
+& petroleum & 52.1 & 47.6 & 43.2 \\
+& bituminous coal & 19.1 & 19.8 & 20.0 \\
+& brown coal & 9.9 & 10.0 & 8.6 \\
+& natural gas & 14.2 & 16.5 & 15.1 \\
+& nuclear Energy & 2.0 & 3.7 & 10.1 \\
+& other\footnote{Wind, water, solar energy, and so forth}
+ & 2.7 & 2.3 & 3.0
+\end{tabular*}
+
+\emph{Source:} Energy Balance Study Group, Essen 1987.
+\end{table}
+
+\noindent \textbf{Answers to the questions from exercise 4.15}:
+
+\begin{enumerate}
+\item With \verb=@{}= at the beginning and end of the formatting
+ definition the additional space of half of the column gap size
+ in front and behind the table which occures by default, will
+ be suppressed.
+\item With \verb=@{\extracolsep{\hfill}}= at the beginning of the formatting
+ definition additional space of equal width would be inserted
+ between all following columns so that the total tabular with
+ becomes exatly the ordered width of 118 mm. Try this modification
+ as special exersice.
+\item \verb=@{\extracolsep{\hfill}}= is to put behind the
+ second column parameter and its countermanding
+ \verb=@{\hspace{1em}}@\extracolsep{1em}}= is to put behind the
+ third column parameter. With \verb=@{\extracolsep{1em}}= as
+ countermanding expression the gap between the third and fourth
+ column would be smaller than those for the following column.
+ Try this as alternative exercise.
+\end{enumerate}
+\end{document}