Width and flux relative to the continuum of the strong Fe I lines are compared with the SOAPv4 models. The line properties from the models were computed using Turbospectrum (TS in the legend) under both LTE and NLTE conditions, as well as with solar observations from the IAG ATLAS of the resolved Sun. Top: comparison of the simulated profiles with the recovered line widths for the joint observations. Bottom: comparison of the measured intensity flux relative to the continuum.