Extinction

E(B-V) = 0.071 (Shlegel et al. 1998)

Av = 3.1 E(B-V)

$N_{\rm{H,ISM}}$/$A_{V,\rm{ISM}} = 1.79 $\pm$ 0.03 \times 10^{21}$ cm$^{-2}$ mag$^{-1}$ (Predehl & Schmitt 1995)
$N_{\rm{H,ISM}}$/$A_{V,\rm{ISM}} = 1.89 \times 10^{21}$ cm$^{-2}$ mag$^{-1}$ (Osterbrock D.E. 1989)
$N_{\rm{H,ISM}}$/$A_{V,\rm{ISM}} = 2.22 $\pm$ 0.15 \times 10^{21}$ cm$^{-2}$ mag$^{-1}$ (Gorenstein 1975)
$N_{\rm{H,ISM}}$/$A_{V,\rm{ISM}} = 2.31 $\pm$ 0.04 \times 10^{21}$ cm$^{-2}$ mag$^{-1}$ (Guver et al 2008)

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