Fig. A.1

Degree of circular polarization Pc for α = 53° and a modelatmosphere as close as possible to that used in Fig. 12 by Kawata: the atmosphere consists of a single layer with bm = 0.51 and cloud particles with ba = 128. The cloud particles are described by a two-parameter gamma size distribution with reff = 1.05 μm and veff = 0.07, with a refractive index equal to 1.458.
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