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ESO - Some OmegaCAM detectors show an odd central stripe in the bias and master bias images.
 
 

Data Reduction Frequently Asked Questions

Some OmegaCAM detectors show an odd central stripe in the bias and master bias images.

Two OmegaCAM detectors (ESO_CCD_#68 and #90) show a centrally elevated structure in their bias frames. This structure, however, remains constant with the underlying bias level and can be easily corrected.

The image showing the central feature in the bias of the detector ESO_CCD_#68 (left panel). The right hand panel shows how well this feature can be corrected.