Fig. 1
Na I doublet at 3302.368/3202.987 Å (left panel), and Na I D1-D2 and the stellar He II (right panel) line are shown for the seven selected single-cloud line-of-sight (one main cloud component) and the multi-cloud target HD 169454. The Na I spectra have been shifted to their air rest wavelengths. The same velocity shift has been applied to the Na I D1-D2 lines. The applied color coding is used in all other figures as well.
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