>Unrelated to the CCD itself, there is saturation in the echelle data system >at about 38,000 DN. THis is one third of the CCD saturation itself. For What about the extraordinary hysteresis we've been seeing? At the beginning of May, a ten second observation of Arcturus (which is bright, but still only a star) resulted in a saturation pattern that persisted after twenty biases had been taken. Russet. APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 352 in the apo35-general archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-general/INDEX.html APO To join/leave the list, send mail to apo35-request@astro.princeton.edu APO To post a message, mail it to apo35-general@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO