Reflection of a bright star on image r414326, CCD#2. On the left side the Hα image is shown. The pixel mask is shown on the right. Black corresponds to masked pixels. The bright star is located just outside the top edge of the CCD. This creates a cometary-like tail that covers about half the CCD length and a square reflection near the CCD top. The usual circular reflection is also visible at the top. As the masked pixels are generated from the catalogued sources, it can be seen that a lot of faint spurious sources are detected due to the reflections.