Fig. 4

Wavelength dependence of the ratio R21 of the equivalent widths of the C2 DIBs (4364,4727, 4735, 4964, 4969, 4980, 4985, 5004, 5176, 5419, 5513, 5542, 5546, 5763, 5769, 5793, 6729 Å, Thorburn et al. 2003) and of the main ζ DIBs (5494, 5545, 5797, 5850, 6196, 6376, 6379, 6614 Å) listed by Ensor et al. (2017), on the lines of sight of HD 204827 and HD 183143 (Hobbs et al. 2008, 2009). The vertical arrows indicate a lower limit of this ratio for the C2 DIBs not detected on the line of sight of HD 183143. Small red dots denote all other 260 DIBs detected on both lines of sight (Hobbs et al. 2008, 2009).
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