Fig. 6.
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Ratio between the chemical equilibrium constants with and without the tetraneutron, Kc[i], as a function of density. In the calculation with 4n, we take its binding energy as 
MeV. The FSU EoS is considered, and the scalar cluster–meson coupling is fixed to xs = 0.85 (top) and xs = 0.92 (bottom). We fix the proton fraction to yp = 0.41 and the temperature to 5 MeV.
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