Comparison of four representative wavelength portions with FTS solar atlases. The PEPSI spectrum is always plotted as big black dots except in panel a where only the PEPSI spectrum is shown. Panel a: full Ca II H&K doublet; panel b: zoom into the core of the Ca II K line compared with the NSO FTS atlas (line); panel c: Mn I 5394.7-Å line. The NSO and IAG FTS atlases are plotted as lines (the more blueshifted line is the NSO atlas). Panel d: O I triplet line at 7771.9 Å. In this panel the IAG FTS is plotted as a line and the NSO FTS as small blue dots. Both atlases are adopted with their nominal spectral resolution.
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