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Fig. 3.

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Correlation studies for the C bands. The normalised EWs of the two C DIBs and the DIBs at 6203, 5780, and 5797 Å are plotted against the fraction of neutral hydrogen fH (top) and the colour excess EB − V (bottom). We note the very specific behaviour of C compared to other DIB carriers. (a) Normalised EWs of the C DIBs as functions of fH. (b) Normalised EWs of the other DIBs as functions of fH. (c) Normalised EWs of the C DIBs as functions of EB − V. (d) Normalised EWs of the other DIBs as functions of EB − V.

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