Fig. 4: Interspecies radiative transitions (IRT) versus plasma density.
From: Interspecies radiative transition in warm and superdense plasma mixtures

DFT calculations are done for superdense Fe–Zn mixtures at kT = 50 eV but different plasma mass densities: a ρ = 500 g cm−3, b ρ = 1000 g cm−3, and c ρ = 1500 g cm−3.