Spectral energy distributions for the dust compositions described in Sect. 2.1and Table 1. The SEDs were obtained considering a cloud with central density nC = 105 H cm−3 (Eq. (2)), illuminated either by the standard ISRF alone (solid lines) or in addition to an internal heating source (dashed lines, see Sect. 2.3 for details). The orange lines show the case where the centroid of the log-normal size distribution is a0 = 0.1 μm, the pink lines where a0 = 1 μm, the green lines where a0 = 10 μm, the red lines where a0 = 100 μm, the black lines where a0 = 1 mm, and the cyanlines where a0 = 1 cm.
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