Fig. 8
The predicted photometric band ratios R1 (mid-IR) and R2 (far-IR) as a function of U and the ratio between the mass abundance of small (YSG) and large (YLG) grains (see text). Note that the band ratios are shown on logarithmic scales. YSG/YLG is given relative to the diffuse interstellar medium value of 0.10 for the DHGL value, which is shown by the open diamond.
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