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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, if selecting TODO: put in two examples together with  screenshots of choosing the database EXIOBASE for 2007 and specifying export accounts for  the result. perspective, 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}).