Influence of a (hypothetical observational) filter width (Gaussian) on the intensity contrasts at the nominal line core wavelength. The contrasts are given for two positions on the solar disc, μ = 0.32 (red) and μ = 1.00 (black), as well as our three calculation methods (asterisks: LTE; plus signs: 1D NLTE; triangles: 3D NLTE).
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