Best fits (continuous curve) of the solar Fe i 5434 and 6608 Å lines (bold dots in top and bottom panels, respectively) obtained from the non-LTE calculations with S_H = 0.1. Fitting parameters are given in Table 5. For Fe i 6608 Å, dotted curves show the effect on the theoretical profile of a  ± 0.02 dex variation in the final Fe abundance. The macroturbulence velocity was reduced by 0.3 km s^-1 for  dex and increased by 0.2 km s^-1 for  dex. The bottom panel illustrates that the errors caused by an abundance variation in fitting the solar iron line profiles are small.