Spectral energy distributions. Shown are the average normalized spectral energy distributions for H II regions (dark grey filled area) and PNe (black curve). The SED for dust of temperature 24.8 K is overplotted with a dashed line. Error bars show the standard deviation in each data point, and are to the left of the points for H II regions and to the right for PNe. There is considerable difference between the two average SEDs of H II regions and PNe.
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