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\begin{document}

	\centering
	
	\begin{tabular}{l|c|c|c|c}
		~		& \multicolumn{4}{c}{{\bfseries Research Institutes}} \\
		\cline{2-5}                          
	
		% ... >>> lost row(s) with locations <<< ...

		% To do:
		% Re-insert a row with the locations of the 4 institutes!

		~                          & Eawag  &  Empa  &   PSI  &   WSL   \\
		\hline
		Journal Article            & 11278  & 14407  & 31141  & 11543   \\
		Newspaper/Magazine Article &  1245  &  1238  &    34  &  3387   \\
		(Edited) Book              &   282  &   404  &    44  &   920   \\
		Book Chapter               &   739  &   742  &   458  &  2820   \\
		Proceedings Paper          &  1095  &  4613  &  4113  &  2370   \\

	\end{tabular}


\end{document}	
