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This is a significant milestone toward creating lumped arrays of Josephson junctions for ac voltage standards.
Adding a third and fourth junction to each stack will be the next step toward the goal of fabricating and observing steps in 50-junction stacks in order to create a 2 mm long lumped array with 50 [omega] impedance.
Using this distance, species are progressively lumped by average link clustering (Gordon 1980) using the IMSL (1991) subroutine CLINK.