This article has an erratum: [erratum]
Extinction normalised at 10 μm. The black circles, boxes, and the thick black line are observational data from Mathis (1990), Rieke & Lebofsky (1985), and McClure (2009), respectively. The solid coloured lines are for models with the standard size distributions from Jones et al. (2013), whereas the dashed coloured lines show models with smaller sizes as in Sect. 4.4. a) The models presented here are for silicate grains with a 5 nm thick aromatic-rich carbon mantle and carbonaceous grains without mantle (orange), with a 5 nm (turquoise), 7.5 nm (green), 10 nm (yellow), 20 nm (blue), and 30 nm (pink) thick aromatic-rich carbon mantle. b) The models are for carbonaceous grains with a 10 nm thick aromatic-rich carbon mantle and silicate grains with no mantle (orange), a 5 nm (turquoise), 7.5 nm (green), 10 nm (yellow), and 15 nm (blue) thick aromatic mantle.
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