Dual-epoch coverage in a Galactic coordinate illustration. The colored areas have been observed during a second epoch with a time gap of approximately six months under cryogenic conditions. The darkest shade corresponds to the area covered by all photometric bands. The 22 μm band was disabled in the middle shade, and both 22 μm and 12 μm were disabled in the lightest area. Although the white areas are also covered in a second epoch of observations, only the two shortest wavebands were used. Data from this region were used exclusively by the NEOWISE mission extension and will not be published in imaging formats.