Fig. 1.

Extinction efficiencies for the composite grains of size 0.01 µ with host spheroids containing dipoles N = 9640, 25896 and 14440; corresponding to an axial ratio of 1.33, 1.50 and 2.00, respectively, are shown in (a), (c) and (d) in the wavelength region, 3.4–0.10 µm for three graphite inclusion fractions ( f = 0.1, 0.2 and 0.3 corresponding to 10%, 20% and 30% inclusion fractions). An additional 40% inclusion case for AR = 1.33 (N = 9640) is shown in the panels (a) and (b). In panel (b) the extinction curves in the wavelength region 0.28–0.20 µm are highlighted.