390287.fig.004
Figure 4: Distribution of excess microwave emission relative to 100 μm emission with RRL width for HII regions. Data are shown from Todorović et al. (see [61]; red points) and Scaife et al. ([54]; blue points). The range of RRL widths corresponding to different types of HII region are indicated, as is the average RRL width for a classical HII region [24].