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Fig. 3


The ratio of the WISE 22 μm flux to the MIPSGAL 24 μm flux versus the percentage of MIPSGAL pixels that are saturated. H II regions that have some level of saturation in the WISE 22 μm band are shown with open circles and those that do not are shown with filled circles. The two saturated PNe are shown with triangles. The dotted horizonal line shows our cutoff at 0.1% saturated pixels and the grey area shows one standard deviation of the average of the ratio for all non-saturated H II regions. The cutoff at 0.1% separates sources more than one standard deviation from the mean.

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