Comparison of the average MAC at 10 and 300 K with astronomical dust models. The MAC of the “astrosilicates” from Li & Draine (2001) were calculated using Mie theory for a 0.1 μm size grain (black), for a log-normal grain-size distribution with a mean diameter of 1 μm for spherical grains (magenta), and for a continuous distribution of ellipsoids (CDE, green). We note that to be comparable with the experimental data, the MAC are modelled in PE and not in vacuum.