Dust activity of 67P. The left image is a combination of two WAC images taken on 10 January 2015. The dominating fan-like dust feature above the neck region is strongly enhanced by integration along the line of sight, parallel to the fan plane from the active neck valley. This effect is demonstrated by the small images on the right. The lower image was taken with a similar line of sight as the left image, whereas the nucleus is slightly rotated in the upper view taken half an hour earlier. The enhancement by the integration effect does not appear.
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