Please note that the letters inside the diagram below {such as G. H, M} refer to the shapes dened by the line segments {solid or dashed} surrounding the letter. Question: A unit sales tax has been collected from the sellers. In the diagram, if the aftertax equilibrium quantity is Q3, relative to the no tax equilibrium, the amount of the tax (per unit] being paid by sellers {incidence on sellers) is _____ OP2'P0 OPEP2 OP2'P1 OPEP1