Fig. B.1
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Normalized flux spectra measured toward eight background stars with PEPSI (Strassmeier et al. 2015) at the LBT. The spectra are labeled with star identifiers in the top panel and the vertical order of the spectra is the same in the three panels. For clarity, the spectra are vertically offset with increments of 1 in the top panel and 0.5 in the other two.
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