Figure 10

Figure 10: The relation between the mass and the circumferential radius of a spherical NS with piecewise polytropic EOS for which parameters are described in Table 4. For comparison, the curve for the Γ = 2 polytropic EOS with 2 −16 κ∕c = 2 × 10 in cgs units is also plotted (dotted curve). The figure is taken from [107]. Note that if the observational result of [51] (if the presence of an ≈ 1.97M ⊙ NS) is confirmed by 100%, some of the soft EOS displayed here will be ruled out.