Comparison of observed and calculated line profiles around four of the preselected Fe I lines with different gf_flag assignments for the Sun (left) and Arcturus (right). Black lines: observations, red lines: calculations including preselected spectral lines only. All of these lines are flagged with Y with respect to their blending properties. We would like to point out that the gf_flag assignments were based purely on the type of the gf-value sources. Theperformance of the lines in syntheses of the Sun and Arcturus were not taken into account. These are shown here for illustrative purposes only.