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Andor iKon-L problem with risen and irregular background is visible mostly in the upper-right corner but also in the upper-left corner, near the top edge and in the large area bottom-right from the image center. Stellar spectrum before appearance of the problem: First stellar spectrum with risen and irregular background at CCD temperature -85 deg C: Another stellar spectrum with risen and irregular background at CCD temperature -85 deg C: Stellar spectrum with risen and irregular background after changing CCD temperature to -75 deg C: All files: |