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Fig. 3


Calculated Ångström exponents α as a function of particle size for four different minerals. For each mineral we used a lognormal particle size distribution (top panel) and a narrower size distribution of 1/5th that width (bottom panel), where Rm is the median particle size in the distribution. The two gray horizontal lines denote the 2σ lower and upper limits to α obtained from the GTC observations.

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