Fig. A.1
Top: optical constants n and k of metallic iron (L from Leksina & Penkina 1967; J from Johnson & Christy 1974; O from Ordal et al. 1988). Bottom: extinction efficiency Qext of iron spheres, their albedo ω and the asymmetry factor g, as a function of grain radius for λ = 0.36,0.44,0.55,0.7,1.25 and 2.2 μm, using a good-will average of the (n,k)-data in the upper box.
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