Characteristics of the melting transition of nonideal carbon and iron plasmas at different field strengths B (marked near the curves). Lower panel: the value Γ_m of the Coulomb coupling parameter Γ at the melting point as function of mass density ρ. Upper panel: normalized latent heat per ion at the melting transition. The dot-dashed and dashed segments of the curves correspond to the domains of nonperturbative quantum effects (T < 0.5   T_p) and electron response (Z²   Ry > 0.1   ϵ_F), respectively. The dotted horizontal lines mark the OCP values. The filled and open circles mark the positions of the real and virtual condensed surfaces (see text in Sect. 7.3).