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In order to compare the different EE MRIOs included, we aggregated each into the Common Classification System \cite{Steen_Olsen_2014}.   This system comprises the common denominator for all EE MRIOs available and leads to an aggregation to 41 regions (40 countries and 1 Rest of the World, \ref{tab:cc_sectors}) \ref{tab:cc_regions})  and 17 sectors (\ref{tab:cc_regions}). (\ref{tab:cc_sectors}).  Due to the European focus of most EE MRIO projects, the Common Classification includes all European Union countries (except the new member state Croatia).