Mass density ρ = ℰ /c2 vs. baryon density nb for NS matter for the set of EOS presented in Figs. 2−4. Dotted segments correspond to the central densities of NS models, which are unstable with respect to radial oscillations. Relation ρ = ρ(nb) deviates from linearity for nb> 0.3fm-3. Non-linearity grows with increasing nb and is EOS-dependent. For nb ≲ 0.2fm-3, the linear approximation ρ ≈ nbmn (where mn is neutron mass) is valid. (Colour online.)
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