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Fig. 4.
Speed of sound squared as a function of the net-baryon number density, ρB, in units of the saturation density, ρ0 = 0.16 fm−3 for m0 = 700 MeV, αb0 = 370 MeV and different values of the parameter χ (see text for details). The first order phase transitions are seen as plateaux of vanishing speed of sound.
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