Deviation of individual (derived from individual spectral lines) iron abundances from the mean abundance as a function of wavelength, EW, and the distance from the center of the spectral order. The symbols show the average abundances for the five solar spectra and the error-bars represent the standard deviation of the five determinations. Outliers at 3-σ level are excluded. The red and blue symbols correspond to the lines that in the 2D spectrum are observed in multiple orders and in single orders, respectively. The boundary wavelength region (at ~5250 Å) of the blue- and red-arm detectors is indicated by the rectangle. EW measurements are performed on the S1D spectra.