The difference between the line abundances derived from an NLTE and an LTE fit for both 〈3D〉 (Stagger) and MARCS model atmospheres for various Fe I lines, for HD 84937 and HD 140283, as a function of excitation potential of the line. Fits using MARCS model atmospheres are shown as red squares and those using 〈3D〉 model atmospheres are shown as black circles. The differences are given in units of dex.