Top: SEDs for the dust composition Mix 1:50 described in Sect. 2.1 and Table 1. The SEDs were obtained considering an optically thin medium with a column density NH = 1020 H cm−2 illuminated by the standard ISRF scaled by G0 = 10−3, 10−2, 10−1, 1, 10, 102, and 103 plotted in orange, magenta, green, red, black, cyan, and brown, respectively. Bottom: corresponding spectral indices calculated over 1 GHz frequency steps. The spectral indices for a0 = 1 cm and G0 = 10−3, 10−2, and 10−1 are overlapping.
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