Top panel: RV values and the corresponding E(B − V)/NH ratios in units of 1.7 × 10-22 mag cm2, as derived from our WD dust grain models (see text); symbols are as in the previous figures; the dashed line connects the results of WD models of normal curves corresponding to seven different RV values (Sect. 3); the range in bold-face on the x-axis shows the expected deviation of Galactic curves (Bohlin et al. 1978). Bottom panel: behavior of the reddening E(B − V) (Savage et al. 1985) as a function of the predicted total hydrogen column density; continuous line shows the average Galactic relationship found by analyzing a large sample of sight lines whose HI and H2 column densities were measured: E(B − V)/N(H) = 1.7 × 10-22 mag cm2 (Bohlin et al. 1978); symbols are the same as in the previous figures.
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