Fig. 6
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Core-mantle spheroidal grain volume densities. The blue line shows the case of grains with silicate cores with 5 nm-thick a-C mantles and the black line of a-C:H cores with 20 nm-thick a-C mantles. The thickness of the lines shows the little dispersion of the density as a function of the grain shape, oblate or prolate, and elongation.
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