Received: 3 January 2018 / Revised: 12 February 2018 / Accepted: 13 February 2018 / Published: 19 February 2018

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**Abstract**

The properties of dense matter in quantum chromodynamics (QCD) are delineated through equations of state constrained by the neutron star observations. The two solar mass constraint, the radius constraint of ≃11–13 km, and the causality constraint on the speed of sound, are used

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The properties of dense matter in quantum chromodynamics (QCD) are delineated through equations of state constrained by the neutron star observations. The two solar mass constraint, the radius constraint of ≃11–13 km, and the causality constraint on the speed of sound, are used to develop the picture of hadron–quark continuity in which hadronic matter continuously transforms into quark matter. A unified equation of state at zero temperature and

*β*-equilibrium is constructed by a phenomenological interpolation between nuclear and quark matter equations of state. Full article
(This article belongs to the Special Issue Compact Stars in the QCD Phase Diagram)

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