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1. Dirt or dust on thge slit causes 'bad rows' on detector Date: 14/01/1998 (all pixel positons refer to TEK3+500mm camera). Always check the IDS slit-profile with a flat field before setting up your window and position of star on the slit. There appears to be some dirt or dust on the slit between pixels y=455-620. This results in what looks like bad rows on the CCD. With carful placement you can put your star in between these 'bad rows'. But a better solution is to use rows y=620 - 820 which are relatively free. Note that that between 820 - 910 ther is some vigentting, and beyond y=910 the vigentting is very severe. The slit will be cleaned the next time IDS comes off the telescope, as it is impossible to get to otherwise.
Status: resolved
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