| Telescope | MDM 1.3m |
| Date | 9/29/95 |
| Instrument | Nellie |
| Filter | V |
| Exposure Time |
25 sec |
| Other | overscan region |
Problem:This is a plot along the overscan region showing the same ramping structure. The magnitude of the variation in bias levels is small - 2.5% which is why it only shows up in short exposure images with little signal. |
Fix:This structure will normally disappear during the processing (overscan subtraction) of the image, as long as one produces a higher order fit for the overscan region. |
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