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The general idea behind the selection is that the user specifies four out  of five parameters and gets an overview of remaining parameter.  For example, choosing the database EXIOBASE for 2007 and specifying export accounts for the perspective, $\text{CO}_2$ CO$_2$  as the environmental intervention, and air transport service as sector result in a result list showing these paramters accros regions (the undefined parameter, see Figure \ref{fig:table}).