Plasma coupling parameter Γ as a function of Rosseland mean optical depth τR. Gray area marks the regime of (strong) coupling where our original assumption of ideal gas law slowly breaks. Presented are coupling parameters for atmosphere compositions of pure iron (red lines) and solar mixture of H and He with metallicity Z = 1 Z⊙ (SolA1, black lines) and Z = 40 Z⊙ (SolA40, blue lines) computed for hydrogen (solid lines), carbon (dashed) and iron (dot-dashed) ions.
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