Next: The Sliding-Cell Detection Program for Chandra X-ray Data . ... The Chandra X-ray Observatory uses an optical CCD in its aspect camera. ... This ``on the fly'' determination allows us to adjust for variations in CCD conditions between dark current calibration observations and provides useful information for identifying bad regions on the Aspect camera CCD. ... As the aspect camera CCD is exposed to radiation, warm pixels will develop. ... Chandra's Aspect camera detector is a pixel CCD. ...