Mass–radius relations of NSs with an isothermal profile at temperatures of T = 0, 5, and 15 MeV. The dotted lines correspond to EOSs with cold crust and the solid lines correspond to EOSs with hot crust (the same as in Fig. 5). Note that the horizontal scale goes up to 20 km, whereas in Fig. 5 it goes up to 30 km. The observational constrains are the same as in Fig. 5. The two arrows indicate the shift in the M–R relation for T = 5 and T = 15 MeV.