Fig. 4
Dust opacities taken from Ossenkopf & Henning (1994) (coagulated, with thin ice mantles, nH = 105 cm-3) and from Cardelli et al. (1989), derived by using a gas-to-dust ratio of 150 (Sodroski et al. 1997). Different ratios of NH/Aλ have been used (Vuong et al. 2003; Güver & Özel 2009; Martin et al. 2012) when applying Eqs. (3) and (4). The insert shows an enlargement of the range covered by the JHK bands.
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