Table 3: The reddening, ratio of the total-to-selective visual extinction, visual extinction, atomic gas-to-dust ratio, molecular gas-to-dust ratio and the total hydrogen gas-to-dust ratio are given for the diffuse interstellar SMC clouds in the lines of sight towards the bar star AzV 18 and the wing star AzV 456.
Parameter AzV 456 AzV 18 Ref
\ensuremath{{E}_{B-V}} 0.30 $\pm$ 0.03 0.17 $\pm$ 0.01 1, 2
$R_{\rm V}$ 2.19 $\pm$ 0.2 2.90 $\pm$ 0.4 1
$A_{\rm V}$ 0.57 $\pm$ 0.08 0.49 $\pm$ 0.11 1
N(H I)/$A_{\rm V}$ ($\times$1021) 2.6 18.4 1
N($\rm H_2$)/$A_{\rm V}$ ($\times$1021) 1.49 0.47 1
N( ${\rm H}_{\rm tot}$)/$A_{\rm V}$ ($\times$1021) 5.6 19.3 1
$f_{{\rm H}_2}$ 0.525 0.045 1

(1) Cartledge et al. (2005); (2) Cox et al. (2006b).


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