Fig. A.1
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Hydrogen-helium mixture of 0.7 H and 0.3 He (in mass fraction) from the equations of state of Saumon et al. (1995). We show the pressure normalized to ideal gas (top) and the adiabatic gradient (bottom). The red curve (top) fits the ideal gas prefactor of 1/(μ =2.35), and the orange curve (bottom) signifies the ideal gas constant value of ∇ad = 0.31.
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