Fig. 4
Profiles of a selection of DIBs with various strengths and widths are displayed with respect to the heliocentric radial velocity. Some normal and unusually strong DIBs in IC 418 are displayed (not in HR 1890 due to the low reddening of 0.08). The Na I profiles show the prominent component at 22.22 km s-1 (marked with a black vertical dotted line) in IC 418.
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