Relative (left panel) and absolute (right panel) spectrum-to-spectrum scatter of spectral line parametersmeasured from five 1D solar spectra as a function of wavelength, EW, and the distance from the center of the spectral order. The red and blue symbols correspond to the lines that in the 2D spectrum are observed in multiple and single orders, respectively. The boundary wavelength region (at ~5250 Å) of the blue- and red-arm detectors is indicated by the rectangle.