Structure of a magnetar envelope having the ground-state nuclear composition, the effective temperature 10^6.5 K, and magnetic field B = 10¹⁵ G, inclined at 45° to the surface. Top panel: thermal profiles calculated using the present EOS (solid red line) and the EOSs where the Coulomb nonideality is either neglected (dotted green line) or treated without account of magnetic quantization (dashed blue line, which is superposed on the solid red line). The melting temperature is drawn by the oblique dot-dashed line. Thin vertical dot-dashed lines mark the points of phase transitions from solid to liquid and back to solid state. Asterisks mark the ends of the convective segment, which is indicated by the arrow. Middle panel: ion charge (Rüster et al. 2006). Bottom panel: reduced pressure, heat capacity, and logarithmic derivatives of pressure.