Left: curves of growth for the Fe i line of Fig. 9 (3D model with  [Fe/H]  = −3.0) as a function of oscillator strength log gf, computed with scattering as absorption (dashed line) and as coherent scattering (solid line). Right: corresponding 3D−3D scattering abundance corrections as a function of equivalent width W_λ for the curves of growth shown in the left panel where χ = 0 eV (solid line), and for a Fe i line with χ = 2 eV (dashed line).