Fig. 6

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Distribution of the reduced enhancement η175 (resp. η148) (Eq. (8)) of the DIB normalised equivalent width, EN, of all DIBs, χa DIBs and χb DIBs, in the sight line of HD 175156 (resp. HD 148579). Both lines of sight have four DIBs with formal values of η> 10.5 (Table C.2 and Fig. A.1). In panel (c), these distributions are compared with more normal EN distributions in HD 183143 and HD 204827, (see also Fig. A.1). The shift δ of the central roughly Gaussian distribution from ENav (Table A.1) is also displayed.
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