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Fig. 7

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Expected behavior of the small-to-large grain size ratio of silicate (top panel) and carbonaceous dust (bottom panel) versus RV values along anomalous sight lines compared with the same along CCM curves (open squares) computed with WD parameters (Sect. 3). Continuous line in the top panel corresponds to the relationship y = ( − 0.37 ± 0.03) + (3.30 ± 0.09), with dispersion 0.18 and anti-correlation index  − 0.91, that applies to normal lines. Continuous line in the bottom panel shows the relationship for the whole sample of anomalous curves y = ( − 0.25 ± 0.03)x + (5.83 ± 0.09) with dispersion 0.19 and correlation index  − 0.65.

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