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This subroutine, called CURRENT for the electrical case, and STRESS for the elastic case, computes, respectively, the total current tensor or the total stress tensor in the system. In the finite element case, the averaging is done over each pixel (finite element), using the finite element average current and average stress matrices, and then added up over all the pixels. In the finite difference programs, the total current is added up over all the bonds connecting nodes (see Section 7).