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We present the first astrophysical measurement of the pressure of cold matterabove nuclear saturation density, based on recently determined masses and radiiof three neutron stars. The pressure at higher densities are below thepredictions of equations of state that account only for nucleonic degrees offreedom, and thus present a challenge to the microscopic theory of neutron starmatter.

Astrophysical Measurement of the Equation of State of Neutron Star Matter