Fig. 1From: A modular bottom-up approach for constructing physical input–output tables (PIOTs) based on process engineering modelsOverview of the approach and methodology for building regional PIOTs from process models and empirical data. Step 1 is described in depth in Sect. 2.1.1, step 2 in Sect. 2.1.2 and step 3 in Sect. 2.3Back to article page