Gray-scale reproductions of the WISE 2 (4.6 μm), WISE 3 (12 μm), and WISE 4 (22 μm) images of 2M1931+4324. The gray levels are linear and arbitrary, and have been chosen to emphasize the more relevant nebular features. 2M1931+4324 is arrowed in the WISE 2 image, while it is not detected in the WISE 3 and WISE 4 images.
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