An example of the iterative detailed modelling of the λ6750.2 Fe I line in 51 Peg. The observed line profile is shown in black with solid markers, and the line profiles synthesised with varying input atomic parameters are shown in coloured lines (corresponding to different log(g f) values). The panels show three of the synthesised wavelength values: λinput −0.05 Å (left panel), λinput (middle panel), and λinput + 0.05 Å (right panel). Each panel shows the full −0.5 dex < log(g f) < + 0.5 dex grid (in steps of 0.05 dex).
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