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tokens: We thank E. Zirnstein and P. Mostafavi for helpful discussions about PUI pressures and densities, shocks, and wave speeds in the heliosheath. We are grateful to both the Voyager and IBEX teams. This work was supported by NASA Grant 80NSSC18K0237 and by the IBEX mission, which is part of NASA’s Explorer Program. J.D.R. was supported under NASA contract 959203 from the Jet Propulsion Laboratory to the Massachusetts Institute of Technology.