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This three-panel display over the Gulf of Mexico shows a visible image at sunset and 3.9 micron and 10.7 micron images two hours later in the middle and right panels, respectively. Notice that the 3.9 micron image is much crisper in appearance than the 10.7 micron image. This is in part due to diffraction, which is less by a factor of 3 at 3.9 microns, and in part because the 3.9 micron channel is a cleaner window. Also, notice how the cumulus region appears cooler at 10.7 microns. This is because many of the fields of view are only partially filled with clouds.