Comparison of the observations of the Ca I 5590 Å line between popular atlases of the three studied stars. PEPSI atlases are from Strassmeier et al. (2018a,b). IAG atlas comes from Reiners et al. (2016), NOAO atlas for Arcturus comes from Hinkle et al. (2000) and McDonald data come from Allende Prieto et al. (2002). The atlases were wavelength shifted in order to match the air wavelength of the 5590 Å Ca I line.
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