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The 3.9 micron channel is more sensitive to subpixel hot spots than the 10.7 micron channel. A plot for brightness temperatures for subpixel fires is shown in the left panel. The 3.9 micron brightness temperature is measurably higher than the 10.7 micron channel temperature, especially for small values of N. As with subpixel clouds, the equations shown are valid for subpixel fires.